It does reduce the speed, I cut the back of my WB flush with the biscuit, to reduce the friction and I lost about 2 fps. I can live with that and the benifits is the arrow is where it has and should be.

As far as accuracy once I got it sighted, accustom to it and did my tuning, it is every bit as accurate as my other rests. I only use my bow for hunting and feel this rest work well for that purpose.