Actually there are other suspension specialists locally. hot bits is one, but have not heard much from them.
I did my E90 with RCS recently , posted here :
http://www.bmwclubmalaysia.com/forums/showthread.php?56021-RCS-shocks-E90-325
a review done sometime back appeared in zerotohundred :
http://www.zerotohundred.com/newfor...cs-suspension-velocity-sensitive-dampers.html
When it was first done, I was so happy - sharp handling and comfort. yes, comfort! especially on rough patches, which i thought never possible.
However discovered an issue after a highway trip - bouncy on certain stretch which appear flat.
So took the car in and Nanda immediately point it could be the rear - pitching they say, (though i thought it was the front ).
So they increase the rear by 0.5bar which is significant. handling was much sharper and the rear pitching not so noticeable anymore.
I was previously on msport which was crappy. The car currently has so much grip I thought never possible and I can feel the four tyres working, hence knowing the limit much better. I'm on Michellin PS.
Nanda retained the rear springs which i thought still stiff and felt sharp on small speed bumps.
Might swap with H&R next time around when its due for service for experiment. The shocks are both nitrogen and hydraulics