I recently needed to replace the steering damper on my Range Rover P38, I ended up upgrading to the Cellular Dynamic Damper DC6006, it is so much more robust than the original and because of the way it is constructed it should operate more efficiently and have a longer life.
Since fitting the damper I have noticed the steering action seems to be much smooth and shocks through undulations in the road are less noticeable.
All in all I am very pleased with the damper and would recommend it to anybody considering the same replacement.