idk how many people remember me from CB, but my "friend" says the X is sort of jittery as far as how it runs vs the incredible. i think the processor doesn't do very well at rendering screen changes while navigating screens/menus and that's what causes the jitter.
btw, my "friend" is one of the testers, so he's had plenty of hands on, real world time on both devices. i usually take his opinion as fact since he mostly aligns with how everyone in the world will use an android device, except he'll use it more than any two of us combined!