Pros...monster consistency with my final setup...gold tip hunters, two blade rage. I hit the same hole in my target for the cycle (20,30,40) numerous times...
if you put a helical on your fletch, and you peel one, its hard to duplicate... if I screw one of these fobs up...I pop another on...no worries about twist and placement...
Cons.. fobs manufacturer says they can stabilize big fixed blades, I didn't have the consistency...so I went to two blade rage mechanicals...you can get multiple practice heads at cabelas...anyway, WAY better
make sure you pay attention to instructions regarding setting up your rest...it make take re-tying in your cord or using a different fork.
You can't shoot "groups" because you'll start banging your arrows together, and the fobs break.
Quiver management...my OEM hoyt quiver was pretty tight...fletching allows for tight fit...fobs kinda not so much...
hope that helps...my thought is way worth it, but something you do in june...