well, I have a challenge by an RIA owner: his bone stock RIA 45 against my US .gov Colt NM service pistol. $1 per shot
I've been involved in variations of that challenge. I've shot several high-end 1911 pistols side-by-side with my RIA, and never has one outshot the other in terms of accuracy. I've also put my RIA in the hands of the owners of those expensive pistols, and still, they weren't able to produce better groups with one over the other. Even in the hands of a damned fine shot (not me!), the RIA produced the same sized groups as a high-end Kimber and a high-end Colt.
When I got mine, new out-of-the-box, I disassembled, cleaned and lubed it, then took it to the range for a torture test. I had 1000 rounds of Wolf ammo, because it's cheap, steel-cased, and shoots dirty. The goal was to shoot all 1000 rounds without cleaning. The first malfunction happened somewhere around round round 800, a stovepipe. Another 30 rounds, then another stovepipe. By the time I got over 900, it was a stovepipe per magazine. When I took it apart to clean it, I discovered that the channel where the extractor passes through the bolt face was PACKED with black crud, prohibiting the extractor from functioning properly. So, if you are planning on getting into a 1000 round firefight, you might want to consider another brand, or at least consider using a beefier extractor.
As far as replacement parts, prevailing wisdom is that even with "drop-in" parts made to milspec, you often "should" have a gunsmith do the final fitting. Meh, I call BS on that.
If I were an Olympic-competition shooter, or a world-class elite shooter, or actually had to bet my life on a gun, I'd worry about it. For me, content to be able to shoot minute-of-middle-of-the-chest for 800 consecutive rounds, an RIA with a couple of drop-in modifications (extended beavertail safety, Pachmyer grips) is all the 1911 I need!