I shoot the old model. It slowed down some but not enough to matter, due to helical. I switched to Blazers and used a razor to cut the fibers to allow my fletching through. Contains the arrow and no fletching contact.

I also shoot the older whisker biscuit model and i do not notice any arrow speed loss (but i have no chrony to back this) but if you do alot of shooting then your vanes start to warp and even peel back slightly, i am actually selling my whisker biscuit and buying an NAP Quicktune 360, same concept but no fletching contact with this model.

I have a shaky hunter, drop zone, biscuit, tiger tuff prong rest- all hanging on the pegboard waiting to be mounted whenever I feel the need to switch.

Right now I have the B2 mounted up and will most likely leave it on. If you do any ground blind hunting it is a benefit to have the arrow stay in place when manuvering the bow inside the blind- that arrow sitting way out in front of the bow while at rest always wants to grab the wall and bump itself off a traditional rest.

The are also the way to go for stalking also.

I had the biscuit (New Droptine) for about a week before I got a drop zone. It ate my vanes real quick.
Chris

I bought the WB yesterday and installed it this morning, shot about 400 arrows today, lost the vanes on 7 arrows. No question, the biscuit eats your vanes up pretty quick.