I fitted Bilsteins on my car (not a Landrover), and even though they were supposed to be the "standard" shock and not a performance model, I hated them at first. It made the suspension feel almost solid. A couple of year on with 30,000 miles more on the clock they are much better though. Unfortunately a stiffer spring needs a stiffer shock absorber to keep the spring under control, so fitting a stiffer spring can be a bit of a double hit to ride quality.