I have had a MP-160 for a few years now. I bought mine for $200ish, so I'm not super-impressed by the price offered here. Still, it's a pretty cool little projector. We use it for family movie nights. In a dark room, we can have a nice big picture (a 7 or 8 ft. diagonal) with no complaints. You can tell that this isn't HD video, but for watching movies or TV, his does the trick nicely.
DO: Use this in a dark room. You won't be impressed if you try to use it with much ambient light. Having a nice white wall or screen helps too.
DON'T: Buy this if you expect to use it as a computer monitor of any sort. It really doesn't have the resolution to support text, and you'll find yourself frustrated by trying.
DO: Use an external speaker. The speaker built into this thing is nearly worthless. If I'm playing video from my iPhone, I use the iPhone speaker over the projector speaker. But seriously...use a speaker, whether it be a stereo or an iPod dock connected in the aux port. It will make your moviegoing experience much much nicer.
DON'T: Think this will be a good tool for playing presentations at business meetings, as the description implies. Unless you want to just show pictures, or REALLY big text, it'll just be frustrating. In summary, this is a pretty neat little projector, but it has some limitations. And although I said that I wasn't TOO impressed by woot's price, it is still a pretty good deal for a little projector that easily fits in your pocket and runs off a battery. I'm glad with my purchase at $200, and I think you probably will be too at $170.