I've used and know trappers that use PRPB. There is no question that many coyotes have found where the pad met the pan with the lure. Having said that, and in no manner, shape or form putting it down, there are other lures that have worked better for me. This may just be a case of, what OGorman himself calls, habituation.
Asking for specific lure recomendations can be a touchy thing to answer. There seems to be at least some regional variation with the effectiveness of a lure and reports to the like, often are interpreted as slamming the lure mentioned.
Not much help am I? Email me if you like.
Take a look at the lure testimonial thread on this forum and you'll get an idea of what I'm speaking of.