No problems with Bumblebee snails here. I've got 4 of them mixed in with my CUC, I've had them since I started my tank about 9 months ago. They tend to hang out together and mostly hide in rock caves. Mine live peacefully with turbos, astraeas, ceriths, nerites, nassarius, and several corals, I have NEVER seen one attack another snail, coral, or anything, when they come out of their cave they kinda just forage on the rock and sand, rarely going on the glass.
I honestly don't understand the bad wrap these guys get, I think it's one of those "he said, she said, they said" kinda things. I hear so much negativity about them, but I don't think I've ever read a first hand bad experience, just repitition of claims made by somebody that somebody knows. Personally, I think these guys are too slow to attack another living snail. People probably witnessed them eating something that was already dead and assigned the death blame to the bumblebbe. I think it's kinda like blaming a dead roadkill animal on the buzzard, just because the buzzard showed up to eat something already dead.