I have mixed feelings about the Biscuit.
I shoot feathers and the original Biscuit did substantial damage to them very quickly regardless of how tight bristles were on the shaft. The new biscuit is supposed to have softer bristles, but I have not tested it with feathers yet.
The other reason I don't use one is that I shoot with my fingers. This rest does not provide the side-to-side flexibility that I need to tune the bow. It does work great with a release though.
One other test that I was able to do when I tried the Biscuit was a speed test. On the same bow, shooting the same arrows the Bisuit cost me about 4fps. in speed. In a hunting situation that is not going to make or break me, but to some people that is important.
On the upside this rest is incredibly quiet. If you wish to use one, I would stick to using a release aid and vaned arrows.