Zrexpilot,
That review is for the older style (all black bristles) and not the newer brown and black ones. I agree the all black oneswill slow your arrow down more than the brown and black ones. I have chrono'd mine (new style) and found only a few fps difference. Not even enough to change my pins.
If the all black biscuit got a 4.5 out of 5 just think how the new biscuts would score. I would also like to add that it states very clearly (as I have) that this is a HUNTING rest.....and a good one at that