I tried several of those fiber optic peeps too, and had the same problem as davidmil. The shine from the peep wiped out my view of anything beyond it. Might be okay for those who's eyeballs are younger than 40, but they definitely suck for those of us in the bifocal crowd.

A peep isn't anything but an anchor reference anyway. If you have a good, consistent anchor to begin with, and practice enough to keep your form tuned up, you don't really need one.