I've owned one for about a year now. It has worked flawlessly since I bought it, and has some nice features.
I've used it for field recording - recorded walking in leaves last fall for someone, and a thunderstorm this past spring. I also use it weekly to record Podcasts at my church. I run out of my Yamaha board directly into the stereo line in (1/8") on the H2. Works really well and sounds good at 44/16. I usually record at 44/16, but have tried the 44/24 mode just to test, and it sounded great. Haven't done anything with surround sound recording yet. I also use it when I'm writing music as a scratchpad of sorts. I just pop in on a mic stand using the screw-in adapter that allows the recorder to sit in a mic clip, and record my ideas.
Built-in mics are pretty decent IMO - not stellar by any means, but for a $200 digital recorder, they are nice.
All in all, this was a well spent $200. It has quite a few features and sounds good. What else could one ask for. Heck, I've even dropped it accidentally a couple times, and it still held together. Mind you, it wasn't a ten foot drop. It's not built like a tank though - plastic casing all around - so I don't want to give the impression that it's super durable.