Not an UMPC
This is a large PDA, it's not an UMPC.
It isn't a PC compatible and can't run desktop Windows.
Handset manufacturer HTC has redesigned its existing Advantage device, upping the storage capacity to 16GB, overhauling the keyboard’s responsiveness - it claimed - and updating the UMPC's software. The Advantage’s detachable keyboard now offers haptic feedback that, much like a similar feature on the recently updated U600, …
You're missing the point - it doesn't have to run Windows, it just lets you do work on the move. Whether you would want to use it as a phone is a different matter. For me, it always was a great PDA, not a very useful phone unless you used it as a landline substitute.
I have had problems with reliability though - a lot of rebooting was always necessary.