Yep, been around since last year, after much demand for a larger capacity mag with extended grip for a few years, at least.
I have one, which so far, has run flawlessly in function.
I've heard of some problems with a few mags, here and there. Mostly to do with some edges or something going into the magwell and making it impossible to load all 9 rounds. Those issues are usually easily and readily fixed with a file if they do happen. However, since it's a manufacturing problem that caused it, it's not something that will suddenly pop up on your magazine.
The only thing I do not like about the 9 rounder is the gap between the extension grip and the normal grip pinches the fingers. Other than that? I like it. In the future will be investing in a few more.