Butterfly fish

[Ruth]

What has people's experience been with butterfly fish in reef tanks? I love these fish but have always been hesitant to put them in my reef. I think my favorites are Tinkers, bannerfish, and pyramid. I know that Emily B has some in her reef with success (other than some zoo skirts if I remember correctly Deb).
So tell me you butterfly stories and if they have eaten your corals what type do they go after? Also clams?