I've had my Wonderfinished full-sized Witness 9x19 for about ten years now. Perhaps the best handgun bargain I've ever gotten. Paid $225 OTD for it, LNIB w/2 hi-cap mags at Bradi's in Camby, IN.
It has been 100% reliable in more than 5K rds. of both ball and JHP ammo in a wide assortment of makes, both surplus and commercial. I have had exactly one failure to fire: a "dead" primer in an old surplus lot. It has never failed to feed or extract.
It shoots precisely to my POA at 25 M with 115 gr. ball OTB, and only about 2" high with 124 gr. NATO ball. Nearly all standard pressure commercial JHPs in the same weight ranges that I've yet tried correspond so closely that no correction has been necessary, for all practical purposes.
I would very much like to try it in a Ransom rest sometime. If I can shoot sub-3" ten shot groups from a bench and bags at the 25 yd. line with my aging, bifocal-clad eyes, I'd bet that the gun is capable of a not-inconsiderable bit more. I've done this on several occasions with WW 115 gr. Silvertips, Federal 124 gr. Hydra-Shoks, and Federal "Match" 124 gr. ball. Almost everything else will fall into a 4-5" average most days which
is about par for me, given the dodgey eyes and inconsistent technique I'm prone to, with most service-grade handguns.