I bought a Sig 1911 .45 ACP in 2009 for use in IPSC. I put 1500-2000 rounds through it in preparation for my Black Badge and 700-800 round through it during the course. Before the course was complete I was getting hammer follow. The hammer/sear were worn out after less than 3k rounds.
I replaced the ignition parts with Cylinder and Slide and the problem was solved.
Maybe things at Sig are better now, but the gun I bought (new) has crap internal parts. Frame, slide, and barrel seem to be OK, but my confidence in Sig was shaken. A new gun owner shouldn’t have to drop $300 on new parts in his gun after 3000 rounds.
Since that time, I’ve owned 3 STI 1911s and they have all performed exceptionally in comparison. My other Sig has STI ignition parts now.
Based on that, I tend to look to the IPSC crowd (which I am part of) when it comes to discussions of reliability and durability in handguns. Most other handgun owners don’t put enough rounds through their guns to really offer an informed view on how their pistols hold up.
In competiotion I’ve seen mostly STIs and Springfields. The S&Ws were popular with the South Africans. And Sig was used by those sponsored by Sig. The Colt offering is a bit too new to comment, but I’ve seen a few at matches and they seem ok. Time will tell for Colt, but it looks promising - especially if the price holds.
One caveat to the above - Sig now produces a Doug Koenig model 1911 with a DK hammer and an EGW sear. This is a competition tested setup that is truly excellent. I would not hesitate to recommend or use that one, specific, model of Sig 1911.
As always, YMMV.