I have a Valentini Pooff. I love him, like all Puffs they have there own personalities. My Puffah has a game where he likes to do "laps", swim back and forth, and if I look at him he'll slow down and look back at me real quick. I can look away and pretend that I am ignoring him, then look back, and he'll catch me watching again, and he'll slow down and look back. It's funny how his eyes move right back to catch ya lol. When I put some Turbo Snails in, he did eat them all over time, but the weirdest thing is he left 1, a big one. It's still in there and he doesnt touch it lol. I also have a HUUUGE Coral Banded Shrimp that I introduced about a year after I got my Puff, and Puffahz doesnt bother him one bit. Also have a hermit crab, and he doesnt bother that either. He eats everything, from Marine-S, to Formula Two, (he prefers the Marine-S), bloodworms, steamers, clams, mussels, silversides, etc etc etc.
I have heard that some of them can be unruly, so I guess its just the particular fish. I rescued mine from a LFS that is notorious for having crappy water/tank conditions for new fish. I got mine when it was small. I felt bad and took him home. My friend had already had the same fish for a few years, and I always liked it. Luckily mine, like my friends, isnt evil. When I did have a Maroon Clown, the Puff did nip at the clowns fins several times over a few months, but I kept yelling at him and pointing at him, and like a dog I guess he eventually learned, cuz he stopped nipping at Doink.