I don't have an 06 but i just installed mine about half an hour ago and i love them. they are stiff (as you would expect from a performance shock) and you can't really feel the bumps. I only ran into one problem when installing them....when i got the top bolted on it was a B**** to compress the shock upwards to get the bottom to go into the holes. I did it by hand on the first one but the second shock i decided not to use up energy and i just put a jack under it and used that to compress it up.
2004 Vermillion Red 4.0 4x4
3" Body Lift
2" Tuff Country AAL
33x12.5R15 BF Goodrich Mud Terrain KM2 on 15x10 Mickey Thompson Sidebiter II
& lots more