I know a couple people who don't go on forums and they use thunderheads and have been maybe since they first came out,,, they love them from what I hear and they will never shoot anything else maybe because they each have so many now but I hear no complaints other than if the head loosens up..
these guys lock tight the heads in the inserts...
they always said they rather be resting than sharpening broadheads so they always liked how they could change the blades easy if dull..
Muzzys are great too a head that was designed by a guy who shot a longbow,, and GVD above showed the right pic sharpening that point it would pop hair,,, I always thought Muzzy was the best when it came to replaceable blade heads because of that convex point Alone!