IF you are already invested in the Apple app ecosystem 8/10 times i'd say stay there as you can't transfer apps between the two.
The build quality is not bad nor is it great (if you want great wait for an HTC phone)
Tiocfaidh ár lá
Droid X 2.2
rooted & Deodeodexed as of 3/26/11
yet to be rooted...
Rooted since day 1