Agree with much of whats being said about the penetration issues. Just thought Id add, the reason i picked some up was not because my bow was "out of tune" or my current heads wouldnt fly, its just that I wanted to try something different, and wanted a slightly wider cut, no particular reason, just anticipating the always possible less than perfect hits. Wanted a bit wider since Id already been using some of the smaller on the market. They flew like darts. Didnt even bother trying very wide cut fixed blades because know form many years experience and quite a few "fast" bows, they dont fly well. And a "tuned bow" in most instances isnt gonna permit most to be shooting in the 300 fps or more range and using 1.5+ inch cut fixed blade heads. At least thats what Ive found from my own experimenting through the years and that of others.