DJ,
I have several in my 2nd cube. And I love them, they really like to eat algae from the back of the tank. I've transfered one over to my SPS tank when the algae got bad, he did a great job.
But I will tell you this, they don't like to be picked up like other snails with shells, they will fight with you by trying to stick hard to the surface. End result is me pushing him all the way up until he comes off.
I nick named them sea hairs, because there long atteneas look like bunny ears.
Mike