You will get a mixed bag of answers. Mine doesn't touch any of my corals. I have a mixed reef with sps, lps and softies. I feed pretty heavily and keep my fish fat, so I don't know if that helps at all.
Lots of people have experience (a bunch of threads on this already. search is your friend). I will say what I always say about dwarf angels in general: they are a risk so if nipping, even in small amounts, will make you nuts don't get one.
The LemonPeel is also not the easiest dwarf to get eating, so perhaps not a great choice for the novice.