i switched from a pro 2 and could not be happier! when the hero first came out i switched to it from the touch pro. . . for a day (and after about 5 hours i knew i wouldn't be sticking with it!) i was die-hard on winmo and the hardware keyboard. the hero was snappy but the lag time from portrait to landscape switching was ridiculous! it went back the next day.
the evo is awesome, i don't miss the hardware keyboard at all and this thing smokes. there is no hesitation whatsoever. i have had the occasional force close of a 3rd party app, but it's quick and painless and opens on a relaunch (not needing a reboot). i am so happy to be rid of my pro 2. . . it's night and day between these two devices