Ive got one. he is a big baby- sticks around his cave most of the time, making random, brief, appearances, then running off to his hiding spot again. I do Really like him though, and would love to get a few more.
Ive had no issues with aggression; he and my ocellaris are always within about 6 inches of eachother, and there are no problems. I dont know if I would trust them with very small shrimp, but otherwise, I think theyre great fish. Unbelieveable color.