I guess the fact that Feinwerkbau already had a well established track record with the 65 air pistol meant they were already accepted as one of the top manufacturers of match airguns. I also have a FWB 65 and Original model 10 and again they are both superbly accurate.
I personally really like the Giss system, when working well they are amazingly motionless on firing - almost unnervingly so.