I have a similar kitchen aid grinder to yours going spare. I also have the kit to upgrade it to Mazzer burrs (new burrs included) I never got round to installing cos it worked well enough for my needs.
I half heartedly tried selling it a few months back:
If you fancy staying with what you know, make me an offer?
I’ve had one for some 6 years now and its a faultless bit of kit. Feels built like a tank, heavy, solid metal construction. Powerful motor and nice burr set. Easy to dial in, great touchscreen, and low retention. It’ll probably live as long as I could ever expect it to.
A friend of mine uses them as decaf grinders in a professional setting, and they hold up to that abuse too.
Quality wise, mine is used with a la Marzocco Linea Micra machine, and the grinder is perfectly comfortable in this company. For home use, there is no better all rounder IMHO.