I like the MSport seats but I think they could have been designed a bit better in the side bolster adjustment area. I'm not a big guy at all (172 lb and 5'9"). The seats are comfortable with the side bolsters fully widened. Any adjustments narrower can become uncomfortable. In fact, I'm surprised just how tight you can make them. I have a couple of friends who are big and on the wide side, who ride shotgun when we go out with the wives. I can imagine that if I'm comfortable with them open all the way that they might feel pinched. Bottom line is that the range should be shifted (IMO) to not be so tight on one extreme and open up wide on the other. However, I do like them.
2013 x35i (Space Gray, MSport, CW/CWII, DHP, Premium, Premium Sound, Technology, BMW-Apps)
Retired:'09 C300 4Matic, '09 GTI, '06 750i, '05 C55, '04 R32, '03 M5, '02 GTI, 01 M5, '00 M-Coupe, '00 540i/6, '99 M3 Coupe, '98 M3 Coupe, '96 328i, ..., '86 4000CS Quattro, ... too many to list