One of our tanks has TONS of the little boogers. They've actually left my live plant in there alone, only eating leaves that are dead/decaying, and leaving the rest alone.

I don't mind them being in there, though some folks don't like them aesthetically. They certainly have made a difference in how long I can go between cleanings... they eat any leftover food, a lot of the fish waste, and most of the algae. Go snails, indeed! :D

I took one of the bigger ones out a week or so ago, and put it in my betta bowl. At first the fish tried to eat it, but I guess it wasn't really interested, because now the snail is munching happily on a dying bamboo leaf.