I switched my M550i from Goodyear F1 RFT to Michelin Pilot AS/3+. I had ordered the car with the spare in anticipation of doing that. Note I wanted the specific rims so that forced the tire choice from the factory.
The ride is improved with far less crashing over potholes. Handling is a match, even going with the all season. I can also deal with light winter conditions. My only complaint is the AS/3s are a bit noisy at speed but they've gotten a bit better now. Or I'm used to it
The obvious downside to the spare is about 3" less height in the trunk. A toolbox I carry for autocross and other events just barely fits, so not much height.
Note the tires were less than a month old when I got a screw in one. So now it runs with a plug/patch.
I didn't get a road hazard warrenty with the Michelin but at least I still have coverage on the wheels.
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2020 X3M non-comp, Alpine White over black : Exec Pkg, ventilated M Sport seats, 20"s
2020 M2 Comp, Sunset Orange/Blk: Orange stitching, DCT, exec pkg, bicolor rims
Gone '18 M550i, '16 X4 M40i, '15 M5, '13 X3 35i, '12 335is, '11 X5 50i, '09 Z4 35i, '08 550i, 06 X3, 06 650i, '02 M5, '99 540i