I have them all the way around. Pretty nice shocks. When I first bought them, they were way too stiff for X-Country racing. Walker Evans revalved them for free the first time. I can't compare them to the Fox shocks because my dealer traded them in, so they had to be like new. Since then I revalved the rear once more to fine tune it. Pretty easy to revalve.
These shocks use a needle for the postion sensitive portion. I have my rear real soft so the machine sits low and when the needle hits it stiffens fast. I have yet to bottom the shock out because of the needle.
The only downfall to these shocks is that they have no rebound adjuster, to adjust the rebound, the shock has to be revalved.