I myself am currently using the Tmo's 8800 and find it great. Gone is the squeeky side rails from AT&T's 8800 although they are identical. There have been a lot of threads popping up on the quality issues of the 8300 as well as crashes and what nots. But you all have to keep in mind that people generally post when they have problems and issues. Especially when a brand new products just launched there will be issues. But if you consider how many 8300s have already been sold compared to the numbers of issues that people on this board have brought up, we're talking about a very tiny percentage.
I learned that no matter what device and what bleeding edge technology it has, there will always and I can say that with 100% certainty, that there will be issues and some will complain.