I was using them in my Leviosa the whole 08 season - they are good! Centering, speed, strenght, all was very good.
I had two of the 20 FMD on ailerons, the 20 UMD rudder (unlimited power!), two of 13 ACBs on elevator halves.
Could not have been more satisfied. After 200 flights did not see any slop or degradation in performance.