From a mere DIY-er to you: Welcome to the Forums!
We had a lovely (and expensive) Wolverine Brass ballcock installed in a toilet that was in the house since 1927 (the toilet, not the ballcock). When it needed repair, I realized that it would be faster/cheaper for me just to chuck it in favor of a Korky 528. Beautiful old things are nice, but I think I was the only one who ever watched it work. Wasn't worth a $100-plus service call to fix when I could just replace it for $12 with something that will last for years. Sad, though. Probably how the horseshoe-maker or silversmith felt.
PS Terry posted a photo on here the other day of the 528PRO, which looked pretty badass. It's basically a pro version of the 528MP. He says he installs it a lot. Maybe a change of pace from that 400A. And it's Made in the USA instead of hecho en Mexico, which might be a good marketing point there in SC. (I know my relatives in Georgia like to buy US stuff, for example.)