I've had B14's fitted on my '07 saloon. Rear offside DRC sprang a leak, then gave in altogether. Knocking, banging along with front nearside. Bilsteins are by no means a harsh ride and seem fine to me. Each driver will have their own preference I guess.
Looks like I am in the same boat chris_m. Found out last week my o/s rear had a leak, today gave in altogether. Knocking/rattling and a small pool of oil near my rear wheel when i parked up Evidence of some oil on front n/s shock too.
After reading your thread I may well opt for B14's