I've had my ttx from psi for over 5 years now and its hands down the best suspension I've ever owned - and the support from psi is amazing. For me reliability is important since I don't have the time to wrench on cars anymore. I haven't had one issue, squeak, rattle or leak on the ohlins since I've owned them.
You are correct in that they use much less spring rates than other setups. When I first got them, I reused they spring from my previous setup and had to lower them (back to psi's original recommendation). The mechanical grip of the lower spring rates feel improved to me but I don't have any empirical data other than seat time in each.
You certainly can't go wrong with bimmerworld products and support, so you have a serious first world problem on your hands.
Good luck!
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