Yeah, I guess instantaneously was a poor choice of wording. I just want to make sure I'm not playing live, go to change presets and find out there is a 1/2 second delay. That sounds small, but it's enough to really throw timing off for certain things.
As far as finding YouTube videos of people using it live, I've only found ONE video of someone using it live. Nearly every video is showing it in the studio or the profiling part of it.
Well, half a second lasts... a lifetime! LOL
As for the pros, there are lots of them. See wikpa.org for a partial list 