Thoes who have upgraded to the stealth v6 esc has said it has more punch.
Of course it looks cooler but it also runs a little cooler.
I can't find the report, but I believe there was a question about delayed throttle response if you are stabbing the throttle repeatly in quick succession (100, 0, 100, 0, 100 throttle).
Normal throttle response is quicker as well, I think I read.