Why? Because it's extremely fragile. I got one a couple of weeks ago (sponsored by my company, otherwise I wouldn't have shelled out $399) and after just 2 days I found the screen cracked in 2 places. It's true I carried it in my jacket's pocket while driving, and it probably jammed against my leg or something, but I've done that with other phones and didn't have this issue.
Of course, calls to the store, AT&T warranty and the manufacturer were all fruitless. The store won't accept it back because it's not in 'like new' state, and AT&T's warranty doesn't cover cracks in the screen. My best option at this point is to send it to the manufacturer for repairs, which will run me another $190. For now, I'm just using it as is, but I just want to tell whoever bothers to read this that I'm not happy -- not with the Tilt, and not with AT&T's customer service. There. Take that, AT&T.