I have not, Germ... I held them and admired their craftsmanship (seriously) at the ATA, but I haven't shot one yet.

Like you, that will be the determining factor for me as well. Like I said, I'm thinking of putting one on my new Allegiance for my next elk trip this coming fall, but if it makes a scraping sound as I draw, I'll revert back to my trusty Zero Effect.