Just to add an update. My SIG 1911 had about 500 rounds thru it and one instance of a failure of the slide locking back. But other than that no further issues. And in regards to that failure, I justice sure the slide catch is well lubed and I have had no repeats of that failure.
It's just a solid platform and SIG does it quite a good amount of justice. IMO SIGs are well worth the $$ they command.