So I'm going to try for my certification again. No ETA yet, but it is a goal for 2016.
The difference between now and when I had the formal training and still failed the test spectacularly two years ago is that I have that much more experience with OS X under my belt and it's something I actually want to do (instead of it being something that I had to do). I'm also realizing that as I make my way through the lessons that I already know most of this stuff.
I have no need of a Mac cert for my present job, but it builds my own knowledge for knowledge sake, looks great on a resume, and I would still like to move into supporting a Mac environment at some point. For that, it will be a necessity.
I told my boss the other day (who's also a OS X user at home) that now—more than ever—after fighting with Windows 10 every day (even keeping in mind the problems inherent in OS X that I've written extensively about here) that I want nothing more than to go home every night and kiss my Mac.