Do a search. There's probably been 10,000 threads on here about the WB. Great, accurate hunting rest. I shoot helicals, both plastic and feathers, and no problem. You will have to tune your bow or you will get vane damage. Speed loss is more like 2-3 fps, nothing worth noting unless maybe you were shooting a really slow bow with really heavy arrows. Like everything else, you'll really only know for sure if you try one. More people than not that have actually used them love them.