I have kept yellow tangs in the past with no problem, they are relatively peaceful and they can be kept with a vast array of species, including peaceful to aggressive. I kept mine for several years with a lion fish, and trigger in a 75gal. with no problem. yes, they grow quite large. and all tangs are infamous for stressing easily and contracting ick.
the controversy is their quick growth, and tank size. Its a personal decision to go for it or not.