They are crap and are way too fragile, expensive and you may or may not have to completely change your rig as well as buy special arrows.
They are about the same price as other broadheads, Maybe a bit more. I bought some regular hunting arrows for $5 bucks and they work great with the broadheads. There are two things that I personally dont like about body shots on turkeys. One is that the chance of wounding and not recovering is a lot higher than using the Guillotine, Also depending on the shot you can lose some of the meat.