Interesting topic as I'm wondering about switching from 108's.
On my old roadster I stripped the originals, had both inners and outers powder coated and reassembled. After less than two years the lacquer started to bubble on a number of the m7 bolt holes. Was washing my coupe the other day and noticed.. weirdly it's only on the rears.
got a spare set in the garage and am contemplating refurbishing them and having the existing set as a winter set, it's just more hassle, cost and time, and they will never be as durable as a one piece alloy.