Well, since I only put about 30 rounds through it with what I had left over from service pistol practice, all I can report about function is that is was uneventful and, now, on target. Tomarrow, its getting wrung out with quite a bit more ammo, so I'll update. Fit and finish are great, but man are those serrations sharp! All together a great piece.
The finger grooves are the Pierce model which slips under your current grips. I'm not yet sold on them and this is currently their "trial by fire". They feel great around the front and fit my hands like a glove, but they do make the grips stick out just a bit more on each side. Also, the rubber is real grippy, so it tends to grab clothing, although not terribly so.