I've had the phone for a couple of months now, and I love it.
I had some concerns about the size before I purchased it, and it is bulkier than a normal phone, but the extra screen size and functionality are worth it.
The phone has excellent build quality, the slide and tilt keyboard is slick and smooth, excellent typing action, though I do find the need for the function key to get the numeric key pad a bit of a pain.
The 3 Megapixel camera is good quality, but takes ages to focus.
I love the 3G data access, it's a sea change in phone use, having fast internet access anywhere. I've also set up push email using Exchange.
I tried out the HTC TouchFlo system, but in the end installed the Spb Shell that I had for my old phone.
I've installed Egress as an RSS reader.
At the time I was also considering an iPhone, and although the interface of that is lovely, I think I made the right choice. Perhaps when the iPhone has 3G and push email I could reconsider.