I started with one and shot in the 880s with it. I documented round counts back then and put 54,000 rounds through it before I switched to a .22 conversion on a 1911. I broke a trigger bar at around 35,000, but otherwise it was fine.
The new ones are mostly okay—the Mainers that make them are fiercely proud of having that production line and do a good job.
Like Hammerlis, they hide their round counts well. Some of the old ones are so shot out, they need their barrels relined. You can estimate round counts by how battered the barrel face is from the steel insert in the slide (over the firing pin hole).
Old or new, a few of them are complete dogs and never seem to run reliably despite very competent Bullseye smiths trying to fix them. I don’t know why that is, but you see it every once in a while on the firing line.