I have both full size and commander SR1911's, and they are a joy to shoot. They are my first (and only) 45's so I can't compare them to anything else, but the full size has 500-600 rounds through it and the commander only has about 200 rounds, both without a single issue or problem.
I also have a Kimber 9mm Ultra Carry II 1911 that has had it's share of problems, including one issue that required a 6 week visit to the factory when it was brand new. I bought it for cc, but it's become a range gun based on it's reliability (or lack thereof).