I got my 4506 upon ETS from the Army in 1989. I shot tens of thousands of rds thu it. Tons of 45 lead SWC reloads that I did on a single stage press! That gun never let me down and would still be a go to although we have to use a 40 here. Still I got it since I was applying for several LE agencies and wanted a 45 but many didn't allow SA guns plus the S&W had an extra round.
The heft of it really absorbs recoil and adds to longevity of the gun. Mine is the square trigger guard but I have a round guard as well