Yeah, there's a reason Takashi Amano loves them (aside from the fact that they look pretty cool, and get quite large). I wish they were as easy to breed as Red Cherries...
Rachel, do you know whether the ones you get in are wild caught, or captive bred? I'm not sure I've seen any reports of successful breeding from amateurs... apparently they need brackish conditions to hatch the eggs (a la Nerite snails)?