Evo 3D is way better than sensation.. Im using Evo 3D and bought my cousin sensation before i got my evo. Super smooth compare to sensation as the RAM is 1 GB in evo and 768 for sensation.

The battery get's hot if you constantly use it for some time that's normal but not super super super hot like someone commented up there.

One more thing, when you put evo inside your pocket with the screen facing your thigh. you will feel it's warm that's all overall superb phone