FYI - I just looked at the FAQ on GPRs website - it does damp in both directions. e.g. away from center and also back to center. In my opinion, it is more desirable to have no dampening back to center - like ohlins/scotts and wer dampers. If I were solely riding desert - it wouldn't be as big an issue for me, but if riding both desert and switching over to tight woods, I think the scotts/ohlins would suit your needs better.
"...the damping progressively gets back to 100% incrementally as you are getting closer to center and the damper is automatially rebuilding it's internal compression. You will have have progressive and increased damping back toward center, while other rotary dampers feature a zero return to center, where they give the rider no damping once the unit has turned itself off until the bars are at zero degrees. There are rocks on both sides of the trail, so the GPR Stabilizer w/ minimal damping towards center once the sweep brake turns the damper back on has become one of the many trademark features our stabilizer is known."
So, in summary, the scott's/ohlins damper differs from the GPR in that...
1. It has a seperate high speed damping circuit and adjustment.
2. It has adjustable sweep (you can adjust how far away from center the damper is active).
3. It dampens only away from center to reduce rider fatigue and increase rider response (to get bike back to straight).
jeff