Some good and some bad info in this thread.
1). Brenspeed customer support sucks, and I mean SUCKS for everyone. Even spending big money doesn't help - you are treated like shit by everyone except Brent ... And he is tough to get to. Their work is also shoddy. They have a lot of my money, and I will NEVER go back or recommend them.
2) You don't have to return to stock to use different tunes, in my experience, when twitching to a different handheld. The new tuner just assumes the tune in your car is the stock and treats it as such. Right now, my SCT thinks the "stock tune" is a KB setup from years past.
3) I have friends who use Lito, and they say he is a really nice guy and like his work ... But they complain about sometimes waiting as much as 14 days for a tune revision as of late. But, they also love that he is not scared of the US EPA unlike all the CONUS located tuners (READ: turning off rear O2s and EVAP).
In my opinion, there is a vacuum in the market right now for a good 3V tuner.