Mine has small blue brakes and manual adjustable M2 seats + DCT + just plain EU spec and there is no,I repeat no weight gain noticable vs my ex OG M2 (5-2016 DCT)...au contraire it's more connected(front carbon strut anybody?) , and more playable irl thanks to readjusted MDM.
My M2C now has 1000kms on it and just like OG M2, it's a blast.
S55 sound is just what it is, but it pops and it bangs, it's getting better and better.
The way it revs/thrust/and goes to XXX mph is on just another level than OG M2...
But each to their own.
Just believe the guys who drove it for 15minutes/30 miles or so
Cheers
Robin