I have a WB, and while I have not realy shot it enough to make a complete judgment, I will say that the bow I have it on is shooting very well, but I have not realy tried to tune it yet. I did some trimming to allow easier pass through with my feathers, and cut a slot in the top to "top load" my arrows. I don't think you will loose anywhere near that much speed with a properly tuned setup. That said, I also belive that for the greatest possible accuracy a good drop away rest like the Muzzy ZE is the way to go. The WB has some very nice atvantages, but I can't realy give you a "qualified" opinion on it now, but I do think your "proshop" needs to be a little more flexable, and maybe try the product before bashing it.

TAKE YOUR KIDS HUNTING AND YOU WON'T BE HUNTING FOR YOUR KIDS