People today use the Netflix service on their computers, but Netflix (NFLX) has cut a series of deals with hardware partners to make the service available on TV sets through an array of devices.

Most of these devices were designed to do other things: a videogame console, high-definition Blu-ray disc players, a TiVo (TIVO) digital video recorder. So to see how well the service works on these devices, I’ve spent the past couple of weeks comparing the Netflix experience on Microsoft’s (MSFT) Xbox 360 game console, on LG Electronics’ BD300 Blu-ray disc player and on a set-top box from Roku called the Netflix Player. The last, as the name implies, is designed mainly for Netflix service.

The devices suffer from a relatively skimpy selection of videos on the Netflix Internet service. Netflix has more than 100,000 titles for rent on disc, but about 12,000 titles for viewing through its Internet service at the moment, and there’s often a months-long delay after a movie’s release before it shows up online. Television shows generally turn up more quickly, with a handful, like NBC’s “Heroes,” watchable the day after they air.

Still, I find the Netflix service very appealing, especially for catching up on episodes of TV series, such as “30 Rock,” that I missed when they aired. Unlike the iTunes Store and other sites that charge users $1.99 per TV episode and $3.99 to rent a movie online, the Netflix Internet service is free to subscribers to its DVD service on one of the company’s “unlimited” rental plans, which start at $8.99 a month.

Depending on how fast your Internet connection is, Netflix videos begin playing almost instantly, though you can’t keep permanent copies.

Connecting the devices to Netflix through my wired home network was easy in all three cases. I used a wireless home network — more common in homes than the wired variety — with the Roku device, the only one of three products that comes with built-in Wi-Fi (it worked well in this mode). People who want to use the Xbox 360 with a wireless network will have to spend $70 or so on an external Wi-Fi adapter. LG recommends people use only a wired home network to connect to Netflix from its player, including adapter kits that cost about $100 for transmitting data over home power lines.

All the devices require you to create a list of movies you want to watch from a computer, just like Netflix subscribers set up “queues” of DVDs to be delivered by mail. The Xbox 360 offered by far the most elegant-looking interface for browsing through videos in my Netflix queue, letting me glide through a long row of cover art representing the movies and TV shows I selected on my PC.

In contrast, the Netflix menu on the LG Blu-ray player and Roku device were more static, making it more awkward to navigate the expanse of titles. Netflix became available on the Xbox 360 in November as part of a more sweeping software upgrade, delivered over the Internet, that remade the graphical look of the system.

The quality of most of the videos on Netflix is, to my eyes, about DVD quality, though Netflix is adding some titles in high-definition to its Internet library. HD titles were available for viewing only through the Xbox 360 when I was testing the service. Roku and LG say they will make software updates available online this month that add HD support to their devices.

The Xbox 360 also has some annoying quirks when using it as a movie player — including a noisy fan I found distracting. The game controller that comes with the Xbox 360 is clunky for playing movies, so users will need to invest in an inexpensive additional remote-control design for media. The Roku and LG players, in contrast, were totally silent and had acceptable remote controls for watching Netflix videos.

I experienced the most serious glitches with the LG Blu-ray player, which occasionally dropped the video signal to my television set as I was watching a movie. LG says the loss of video signal could have been due to the connection I used to hook the player to my TV, though I’ve never had a problem with other devices using the same connection. The LG Blu-ray player also took the longest of all the devices to install software upgrades from the Internet.

While there are some differences in the Netflix experience on the Roku device, Xbox 360 and LG Blu-ray player, none of them is so great that they should trump other considerations — like a desire to play videogames or watch HD Blu-ray movies — in deciding which system is the best fit.

The LG Blu-ray player is available online for about $300. The cheapest Xbox 360 model is $199. (To get Netflix through the Xbox 360, users must be “gold” members to the $49.99-a-year Xbox Live game service.) But if what you’re after is primarily Netflix movies, and you’ve got room near your TV for another box, the $99.99 Roku product is the best value.

Walt Mossberg is on vacation.

Write to Nick Wingfield at nick.wingfield@wsj.com

There are two models for this legal Internet distribution. Some shows and movies can be purchased or rented from services like Apple’s iTunes or Amazon’s Unbox. You pay a fee for these downloads, which don’t have commercials, and you can keep any videos you buy to watch repeatedly even without an Internet connection.

The other model, common on the Web sites of the TV networks, is free, ad-supported streaming directly within a Web browser. In this approach, you pay nothing, but you have to watch commercials that can’t be skipped. You must be connected to the Internet while watching, and you don’t get to keep the video.

This week, the ad-supported, streaming approach took a big leap forward with the launch of a Hollywood-backed service called Hulu, at hulu.com. Hulu aims to be a legal, one-stop shop for streaming of TV shows and movies from numerous networks and studios. It’s intended as an attractive antidote to pirate sites and to Google’s YouTube service, which has angered the media companies by allowing users to post all or parts of movies and TV shows without permission or payment.

Hulu is a joint effort of two big media conglomerates, NBC Universal and News Corp., each of which operates multiple networks and studios. (News Corp. also owns The Wall Street Journal and the Web sites where this column is published.) But Hulu contains programming from other companies as well, including Sony and Time Warner. All told, it offers full episodes or clips from about 400 TV series, plus 100 feature films.

I’ve been testing Hulu, and I am very impressed with its design and ease of use, and with the fact that it allows users to edit and re-publish its content on their own sites. Despite some drawbacks, it’s the first Web property I’ve seen from mainstream studios or networks that shows a real understanding of both modern Web design and the Internet’s culture of sharing. In my view, it’s far better than the typical network or studio Web site.

Even though Hulu lacks programming from ABC, CBS and many cable networks, it has a fair selection of popular shows, such as “30 Rock,” “The Office,” “The Simpsons,” “Battlestar Galactica” and “Saturday Night Live.” Its movie catalog includes old favorites like “The Usual Suspects,” “The Big Lebowski” and “Sideways.”

The site is organized in a clean, elegant manner. You can browse shows alphabetically, by genre or by network, or you can use an excellent search system. The search system even brings up links to videos of shows on other sites, such as ABC’s “Grey’s Anatomy,” that are missing from Hulu’s own collection.

Watching the material is a pleasure. You can view it in a fixed window or in full-screen view. You can also “pop out” the viewing window so you can place it anywhere on your screen and resize it to your liking. A feature called “lower lights” grays out everything on the computer screen but the video itself.

Even the advertising is relatively painless. TV shows contain just 25% of the commercial time that’s on regular TV. And Hulu allows you, in some cases, to choose the advertisers whose commercials you see, or else to opt to watch a movie trailer at the start of a video in exchange for seeing no further ads during that viewing.

In a break with Hollywood’s past rigidity, Hulu makes it easy to share, even edit, shows and clips. You can repost an entire video, or any portion of it, on your own blog or on social networking sites.

But Hulu also has some major downsides. Most important, Hulu lacks depth. Even with TV series from its owners’ own networks, Hulu typically contains only a small number of full-length episodes, and mainly offers short clips. In some cases, episodes expire after a while. For some shows, such as “Saturday Night Live,” there aren’t any full episodes, only clips. And the wildly popular “American Idol” isn’t in Hulu at all, even though it airs on News Corp.’s Fox network.

This stands in stark contrast to the depth offered on iTunes, where you can find multiple seasons of full episodes of many shows. And it doesn’t begin to compete with pirate sites, where you can find nearly everything.

Also, Hulu requires a decent broadband connection — a speed of at least 1 megabit per second is recommended, and even higher speeds are needed for some content. That means that using Hulu over the slowest DSL lines or cellphone modem cards will likely provide a poor experience.

Another problem is that, unlike iTunes or Amazon Unbox, Hulu can’t be used via a TV set-top box or a portable player. And shows can’t be saved for offline viewing, such as during flights.

Still, Hulu is a good start for Hollywood in finally providing a better experience for Internet streaming of TV and movies. If the service can add a lot more content and make viewing possible in more scenarios, it might strike a real blow against piracy.

Email me at mossberg@wsj.com. Find all my columns and videos online, free, at the new All Things Digital Web site, http://walt.allthingsd.com.