We used one of these yesterday to process our county fair's birds.... really, all that happened was a few broken wings (Like, three out of 200 birds), and a couple cornish (Grotesquely undereight, like 8 oz birds) had parts of skin ripped off. Other than that, grocery store chickens! Worked very well for turkeys, too. I would definitely reccomend it, the time saved is worth the few cosmetic blemishes that occasionaly happen.
Just my 0.02!