In the 11,800 rounds while I had my Ruger 4.25" .45ACP steel-framed 1911,
-two factory front sight blades fractured and came off while shooting;
-a slide-stop lobe broke off;
-an extractor hook broke off;
-this earlier version of this model also didn't shoot to point of aim; I can't remember if it was high or low; a replacement adjustable rear sight cured that problem which Ruger sells on its website; the rear sight also fractured a screw sending its parts flying; a 2nd adjustable rear sight was fine when I sold the gun;
-I must day the gun & I were not to my accuracy standards over 10 yards away. I replaced the barrel bushing with a fitted bushing which tightened up my groups from ~8" to 5" at 15 yards. As I said, I sold this specific 1911, but I'm keeping my other three 5" 1911s of other brands.
As I read this thread, most people have been happy with their Ruger 1911s, however. I really did like the balance of a Commander-sized 1911. Perhaps I'll get another 4.25" 1911 someday.