There is a mechanical engineering paper, which can be found via Google, that studied the dampening ability of this stem and concluded it was the equivalent of reducing tire pressure on a road bike tire from 110 to 75 psi. Pretty amazing in my opinion. I think I'm going to pick one up before my next tour.
Maybe I should play around with them more. I got these mainly for my wife (who used to ride this bike); she is on a different one which also has a Redshift stem and a Kinnetics post.