I recently added a .40 Pro Match to my current RIA stable. I've had a single stack .45 for a couple years and use it when I shoot heavy metal class in 3 gun. It had some teething pains when it was new, but has been very good since then. About a year ago, I added a Tac Ultra HC in 9mm and immediately sent it to Hayes Custom Guns for the full treatment. I've been shooting it since February in 3 gun and using it for limited minor in USPSA, including Area 1 and the Iron Sight Nationals this year. The gun has been practically flawless using MBX mags and the factory mag that Hayes modified/tuned with a Dawson extension and Arredondo insert. I bought 2 Mec-Gar mags and did my best to duplicate what Hayes did and now I can't tell the 3 apart and all run perfectly. I usually use those 3 if they are going to get dropped in something nasty, or if I stoop to shooting a local IDPA match, as they will still lock the slide when empty. I bought the .40 about a month ago off the classified section here. It was advertised as having upgraded internals and a trigger job, and came with 5 factory/Mec-Gar mags with Dawson extensions and Arredondo springs and followers, but not the purple inserts. I learned the hard way on the 9mm mags that without the inserts, you have a salt shaker if you load past the original capacity, so I ordered 5 more inserts immediately. I shot my first semi-major match with the .40 this weekend at the Dixie Cup match in St. George, Utah. The gun ran absolutely perfect and for some reason that I can't figure out, I shoot it better than the 9.
Anyway, I'm definitely an RIA fan at this point, and if I can provide any input to the group on the guns and/or mags I'm using, I'd be happy to help.