I've got the 24" one right now. I haven't had it long, but it's been great so far. One of the main reasons I got it was so I could use it for my computer for any movies I wanted to watch. It has an S-video in which was what I was looking for. For $159, it was a great deal, as most tvs at that price don't come with S-video and are usually less than 24".
I realize that you're considering the 20" which doesn't come with S-video, but I'd imagine the quality is quite similar between the two. Like I said, so far it's been quite good. There's a few things that are odd about it (like if you turn it off with the button on the tv rather than the remote, the remote won't be able to turn it back on unless you turn it on with the button and off with the remote). But other than that, no problems.
I'm a poor college student who was looking for something on a budget, and I think I made a really good choice with this one. If it lasts another 3 years until I'm out of college, I'll be quite impressed. At this point, the lifespan is my only worry about the tv.