i have a flame and it has been awesome. when i added it i was worried the other fish would pick on it, but he went to work quickly deciding he would be dominant fish. my female clown and the flame went at it off and on for a couple of weeks, but now they're cool.
personally, if i were doing a fish only tank and it didn't have dwarf angels in it, it wouldn't be worth doing. the only fish only i'd ever consider doing is some kind of angel/butterfly tank
coral nipping doesn't seem relevant to this thread, but worth mentioning mine has been fine with sps/lps (no acans/zoas/clams)