Well, the e92 isn't without stories, good/bad.
93k miles give or take, I bought it at about 85k.
2011.5, White, Competition Package, black wheels, grills, side grills, carbon splitters/spoiler, tinted windows, carbon roof, DCT, recent P4S tires, aluminum/black/tan interior (I haven't seen another like this and it's a great combo).
Somewhere around 65k it got a new engine under warranty, I have all the docs, just not in front of me for actual mileage. Crank bearings, which is super rare, so they called it a manufacturing defect.
New DCT gearbox <10k miles ago, which given it threw all the same codes a couple thousand miles later that seem to have cleared up after a new battery and battery cables means it might not have even needed the $16k spent... but at least it's new.
Replaced the tank breather to fix the idle, known common issue.
Rebuilt both throttle actuators with new gears. That's a 50/50 shot, but I have found a place to get rebuilds with lifetime warranties for less than dealer parts if it doesn't stick. Factory ones seem to last 50-80k.
Other than that, other stuff all works perfect. At least you know of a couple of things to watch for on them now.
On e36 and e46s there are Vanos things and subframes, on e92s there are throttle actuators, the breather, and rod bearings (this one seems overblown, and was complained about on e46s too, though I never knew of one IRL).
Anyway, on the e92, it's been bad luck for me and I've likely sorted most of it for the next person, but it was time to move on. I love driving it, but I needed something better for my slog of a commute, so I got a Tesla with Autopilot.
M3s in general remind me of SCs and Carreras, there are specific known issues, and they are manufactured to such excellent tolerances, most cars will have them, so everyone knows how to address them.
