They are absolutely my favorite fish, and have personalities. My old one was 8 years old. First he was in a 60 gallon FO, then a 85 FO, and then moved to our 140 reef. He died not no long after that move, don't know why. We used to have air bubbles in the FO tanks and he would "surf" the bubbles for hours on end. He looked like he was having such great fun. The one I have now in the reef tank plays too. He likes to go to the surface and grab a mouthful of air and then swim down deep and expell it. Not sure what he's trying to do, but it's kind of fun to watch.
They are a little more prone to ich that some fish, but I think it's worth it.