I have put a thousand miles on my Red Shift seatpost and stem and am very pleased with their performance. Once you get them dialed in you do not even notice them until you take a big hit. They absorb the small stuff without me even thinking about them. I have ridden asphalt, gravel and fire roads with a lot less wrist ache and seat tenderness.
I like them so much I bought another stem for my tandem and seat post for my stoker. She said the difference was astounding.
Almost full suspension, but not quite.