Hi zouzouni, Welcome!
There's a whole section here called something like 'band to sleeve'. I've not been banded and i'm not sleeved yet, either. But I think there are many ex-bandits on here. Also there is a search function in the main menu area on the top bar (in the old version of the forum), you'll be able to find lots that way too.
I know many people say how the sleeve is much easier to manage than the band. And weigh loss, statistically is better.
Good-luck, and I'll be seeing you around,