Gene tuned my TF89 .177 and it went from about 860FPS to 940FPS. The gun clearly had a few issues when I sent it. However, when it came back it was a much better shooter by far than it had ever been. Recoil reduced as well as torque. The trigger difference was, in a word, amazing. I had to get used to the gun all over again. New spring, spring guide, trigger tune, muzzle brake... improved accuracy, ease of cocking, and consistency. It was so good I didn't hesitate to send a new TF89 .22 for the tune when I got it, even though it was very nice out of the box -- you can see the stats in my signature. I'm betting it'll gain a few FPE, but if it doesn't, it doesn't matter. If it does, it'll be a real powehouse. but it is more important to reduce the recoil, improve accuracy (it was .25 @ 10 yards for me out of the box). it will be the base of a custom project, and for me the tune was DEFINITELY worth it.