What I meant was that the basic version was useful enough as is in its basic function - to sweep the room clear of minions. As such, the new metabreath feats aren't really useful in that they don't really do anything to let you accomplish this any more easily (except perhaps the one which lets you use your breath as a burst). Their benefit is too marginal to justify the expenditure of a feat, IMO, even if 4e PCs to get more of them, IMO.