I've got 2 of them and they are excellent guns. They have everything I want in a 1911 (Extended grip safety, no firing pin safety, no forward slide serrations, no sprayed on finishes, 3-dot sights that are easy to pick-up, a reasonable price point, and an excellent warranty). Probably the best value in a 1911 on the market.
Full disclosure, all my handguns are Ruger! I love my SR1911. The last time I took it out to the range I shot it the best of any my .45acps. It might have even been better than my SR9 that day. It is quite heavy as one would expect. A simple three-dot sight makes aiming a snap. Great looking wood grips. An no fuss trigger. Everything you want in a gun.
I think SR-1911's are pretty sweet. I've shot them as well as RIA and I personally felt like the R-1911 had an ever slightly better finish. I can only speak for the one's I've held/shot. I wish upon a star Ruger will start making them in 10mm.