Things I liked:I compared both X20 & X20s in .22cal. The X20s was much quieter in my opinion. Rifle was achieving FPS /FPE of 602/15.4 with H&N Baracuda Hunter Extreme & 715/13.5 with RWS Hobby. Things I would have changed:Trigger was a bit stiff, and I replaced with a GTX Gen II. I also had the spring replaced with a gas ram by Mike at Flying Dragon, who also tuned the rifle. Now it is really quiet! FPS/FPE of 722/13.8 with RWS Hobby, but 643/17.6 with the Baracudas! What others should know:Stoeger X-Field also run well in this rifle achieving 714 FPS / 16.6 FPE. I highly recommend a gas ram to really quiet the rifle.