This is yet another and final update following my previous review which was exactly 1 year ago. The Crossclimate Plus tires have now done well over 55.000 km (34,5k miles) and are now around 4mm profile depth on average. Specifically: 2 x 4,0mm and 2 x 4,5mm. I rotated them front/back twice. Coming from their new profile depth of 7,1mm, they are just over their halfway mark, if you take the legal 1,6mm minimum into account.
However, since wintertires should have at least 4mm, they are now nearly finished as "certified" winter tires. And in all fairness, I have been pushing them a bit harder over the last 5000 km than I did before, so probably wore them a bit more than average over their whole lifespan.
Still, the funny thing is that if I were to just use them as summer tires from now on, they would probably still last about 20-30k km!
I won't, but still that's pretty amazing.
Overall these tires have never let me down and are just very impressive. Good grip in all conditions and I never had any real surprises with them. Driven them all over Europe: in summer heat at speed on Autobahns, on many daily city drives, occasionally on snowy mountain-roads, through many torrential rainstorms, on cold slushy/snowy/muddy paths etcetc.
On balance, probably the best tires I've ever had, and I've had quite a few.
Since most reviews claim that the Crossclimate 2 tires are more snow-biased then these (which I don't need) I will probably look for another brand alternative, but hats off to Michelin for the Crossclimate Plus!