It looks like buckeye started thread and got his answer, but I think I'll continue the discussion.

I've been shooting with a whisker biscuit for about a year now and have mixed feelings about it.

Pros:
1) Silent during draw
2) 360 containment (you could shoot the bow while hanging upside down and arrow would not move)
3) simple design no moving parts to need adjusted/break in the field.

Cons:
1) I've notice my precision drop (groupings opening from 1-2" at 30yrds to 3-4")
2) wreaks havoc on fletching - typically after 30 shots vanes get "wavy" and after 50-60 shots vanes begin getting ripped off and I need to replace the fletchings

As a hunter I love it, but as for practice I can't stand it, in fact I find that I practice less, because I don't want to be constantly replacing fletchings.

I think I'll give the Whisker one more year, but I have already begun to looking for a new rest, although I may just wait till I buy a new bow, perhaps next year.