I've got the non runflat Dunlop 17s as well. I'd imagine different tyres will be fitted in different markets, but it's interesting that both non runflat Michelin and Dunlop tyres are being used in the UK.
With the Dunlops I'm finding that lateral grip around corners is excellent, comfort is fine (difficult to know as I haven't driven an F56 on anything else), tyre noise is noticeable (because the engine is quiet when cruising) but with DSC off traction is easily overcome in a straight line away from rest even in the dry in both first and second gears. I guess that's the downside of a turbo FWD without a mechanical LSD.