I have the Commander and I love it. The only things I changed were the grips and the recoil spring, as the original spring was a little weak. I have only taken it out once, but I put 200 rounds of WWB, Federal FMJ and Winchester Bonded JHPs through it without a single hiccup. All 200 rounds were fired as fast as I could reload the mags, so the gun had little time to cool down.
I am very satisfied so far. I like this gun better than the RIA I used to own, though the Rock was a good shooter.