T-Mobile HTC HD2. Worth it?

[A R]

I currently have a G1, I know for smart-phones it's pretty outdated but it did it's job. Recently I dropped it and it started to bug out on me so it's definitely time for an upgrade. However, IMO T-mobile currently has a super weak line up of phones out and the ones that have been rumored to be out soon (MyTouch Slide, Garmin, Samsung Galaxy S, etc.) don't really look that appealing nor do they put up much of a competition against some of the other carriers phones. Been with T-mobile for close to 5 years now, their support team has been great when we've needed them, and their service prices are the best around. This is where the HTC HD2 comes into play, I've read the reviews, seen the videos on it, it looks like a pretty awesome device except for the fact it has a crappy OS. Someone I know has one and they say that the user interface from HTC makes the device a bit easier to use. Wondering what some people out there who got an HTC HD2 think about their device now that it has been out for a while and whether or not you guys think it's worth upgrading to one?