I own and carry a SIG RCS. For the money, the SIG is a good gun. The internal finishing on the slide and frame is not as finely done as more expensive guns, but it runs reliabley, and has a good trigger without needing extra work, the slide / frame fit is good, it's mildly dehorned and the Nitron finish is a nice looking and has held up well.
The SIG is a good value in a gun, but it's nothing special which is exactly what I wanted in a carry pistol. If it get's thrown on the ground, scratched, finish gets worn, I lose it to the cops - don't care it's nothing special and easily replaceable.
The first day I had the gun I shot 300 rounds including Winchester XTP loads and it never had a malfunctiion. The gun is approaching 1,000 rounds and has functioned every time I've used it without a problem. I shoot it at least 2x per month to practice with it and always include one 20 round box of carry ammunition at the end. Then the gun gets cleaned, lubed and goes back into the holster.
I have a Wilson Tactical Supergrade Professional and a Dan Wesson VBOB that I could also carry - but generally use the RCS because it's smaller, lighter weight and I have no attachment to it as it's a tool that can be replaced with a phone call - unlike the other two Commander size guns that are both custom and not easy to find a duplicate.