How much you loose on the wisker buscuit depends on the arrow weight and type...carbon, aluminum etc,,... The average is around 4 to 5 fps...I know this to be true from using one myself and testing several different arrow weights and types...It is nice in the respect that arrows do not drop off the rest....The amount you will loose in fps does not descredit the wisker biscuit. I reccomend trying both if you know someone that has them..Trial is the only way to find out if it works for you..