OP is looking for a 40K+ report, and I get it, everybody loves the gear when it's just been installed. Not there yet but at 1 year and 15K, I'm 100% satisfied with the PowerStop Z36 kit on the pavement and off. Steep grades, water crossings, road trips, good weather and bad, they've been solid.
Some say they avoid drilled & slotted b/c of dirt clogging after going off-road. I've been through some mud (the typical kind, not axle-deep suck your shoes off your feet stuff) and never had an issue.
FWIW, here's my passenger side front as of today:
Stay tuned for a 40K update in mid-to-late 2021. ;-)
(Edit: 40K came earlier than expected.)