I use the no-peep and love it. I have never had it fail me in the 3 years I have used and ABUSED it. Like anything, there is a chance of failure, but this is true if you use a peep or not. How many times have you heard of a peep twisting, or filling with snow, etc. If the no-peep happens to fail me, I feel comfortable in my anchor, form, and shot, that I would shoot without it without much problem. You should be able to do this with enough practice and shooting.
The no-peep will tell you if your anchor is exactly the same, or if you are torqueing the bow. It does take some getting used to, but I can't see myself going back to a peep for hunting anytime soon. The best features of the no-peep are having a clear sight picture and during low light you don't struggle to see thru a peep.
Try it and see what you think.
Lien2