RE: Grim Reapers....
I've been bowhunting for two seasons with them. Eight Grim Reapers shot at deer. Eight full pass-throughs. Eight dead deer. The pass-throughs can be attribued to my setup though, and not the broadhead. They kill quickly, require no o-rings or rubber bands, group extremely well and are a piece of cake to tune.
Now for the negatives from a Grip Reaper shooter. For one, they're not sharp enough. Two of my kills were hard quartering shots. Both animals went down quickly, but each shot caught some gut and the blades pulled some of the gut with it and blocked the exit hole resulting in practically no blood trail. This is complicated by theother negative, and that is in most cases, the entrance hole is very small because the blades don't open until they're past the hide. The exit hole is ghastly, though.
All in all, I see no reason to change. They've proven to be very dependable and well made. Make a good shot and the deer isn't going far at all. Only one has been ruined by the shot, and that was because it hit rocky ground after the pass-through.