Agreed Ian, the extra profile makes a noticeable difference. Re suspension - not saying they're different because indeed they're not, but if you take away some of the stiffness that's been engineered then you have to put it back somewhere (stiffer suspension) or you change the dynamics. I know of a National Tyres garage that also won't change RFTs to standards, which I also found odd, but I guess they're either into some weird business ethics or trying to sell you a more expensive hoop!
In some cases it works, but ultimately even with years of tuning experience I wouldn't dare to presume I know more than BMWs R&D department, so I'm a firm believer in the ying/yang of it.
We're on a bit of a de-rail now, sorry.
