I found the kickstand SLIGHTLY more flimsy because I don't use the full angle: I use what was, on the N800, the full angle. The new full angle is for keyboard+kickstand use, which I don't personally understand, but more power to them!

The battery door is significantly harder for me to put back on, but I don't have any reason to remove it now that it's flashed.

The battery door rattles a little bit, or maybe it's the battery hitting the door. Not a dealbreaker.

The build quality so far kicks the crap out of the HTC slider touchscreen phones (TyTn, Mogul, TyTn II) that I've used.