I've had my eyes on one as well but I don't know much about them...It's a good looking fish that I'm surprised hasn't had more of a presence in the hobby.
They are very much like Striped Raphael catfish from what I've gathered. They'll grow to around 10-12" and are nocturnal and will feed at night. As far as only eating live, I doubt it. Most catfish will take pellets or frozen foods readily. As far as worth, $50 seems like a fair price.