Since the Droid came, its been the best Android phone I've own besides my Vogue Android phone back in the day. Easily rootable and a lot features to boot with all the ports from the Nexus 1 and the leaked upgrades.
Now that I got my demo model of the Fascinate, it totally blows the Droids out of water in terms of smoothness and not being loaded down with bloatware. The custom UI is fast and functional and almost just as good as Sense UI only because the Gala S interface is a little too much alike the iPhone interface in someways.
The only downside that might raise some eyebrows is that the Quadrant scores are behind the Nexus, Droid 2, Droid X and the Incredible but it blows thru the graphics portion 5 times faster than any other phone but the CPU side is what brought down the score. For me, processing is not a big deal but GPU speeds are needed with some of the more advance 3D apps on the market.