I just got mine last month but I am pleased with it so far. I have about 250 rounds through it. It shoots CCI 36gr HP and 40gr RN perfectly. I ran a few Winchester Super Speed 40gr RN through it and it shot them fine as well. But it will NOT shoot bulk Federal 36gr. HP, I really didn't expect it to anyway. Accuracy seems to be equal to or a little better than stock form.
It is a great option for getting trigger time in with your G20 without spending an arm and leg. I think it makes a viable trail gun as well, it is much, much lighter than the stock 10mm slide. I've already taken a few rabbits and a couple creepy crawlies with mine.