Capacitative buttons are less responsive than on my Evo, they do require a firm press to acknowledge. Is a little annoying for sure, but not a major issue at this time. However, the screen is more reponsive to touch as compared to my Evo, scrolling is snappier... both phones loaded with same apps (Evo 2.2).
Playing with it last night I made the following observations (as compared to the Evo):
1. GPS is as fast and accurate... EDIT: After additional testing, Evo's GPS seems stronger in acquisition and accuracy.
2. WiFi radio has far better reception using same network.
3. Screen colors are better, have not tested on sunlight yet.
4. Battery life so far seems on par with I get from the Evo, but too early to tell.
5. So far feels as snappy on 2.1 as the Evo does on 2.2 except browser rendering which is faster on the Evo - would be interesting to see how much better it performs with 2.2 and JIT compiler running.
7. As skins go, if I must have one much prefer Sense to Touchwiz. Samsung widgets are quite lacking and find them less useful than HTC's.