It's fantastic, very fast and responsive, thin, and light. We bought ours through Amazon's wireless site and got a decent discount over Verizon's store. I'm not a big fan of the Sense UI, but it doesn't have any major flaws. At this time, I've rooted it using the Unrevoked method, but I'm waiting for a final release of the Android 2.2-based CyanogenMod 6 before trying anything more adventurous.
I think it's great. My only complaints are that the camera is horrendous. Every picture is blurry no matter how still I hold the camera.
Also the speaker sounds muffled and too quiet on regular phone calls. (Yes, the volume is all the way up.)
Oh and the battery life is kind of bad. I had to read a couple of articles and turn off all kinds of things off to make it last through the day. I think the battery has some kind of breaking in period too as it's been doing much better lately.