It shoots about 10 to 15fpe stronger, depending on the pellet. It's slightly louder (the hammer slap/"ping"), a little more recoil, etc. You know, the usual side-effects when you have a power-tuned gun, but VERY accurate. Probably the same accuracy as my other Condors though. They are all accurate. Having had a fully-tuned Talon Tunes gun, and comparing it to my other "more stock" Condors, I have come to the conclusion that $450 for the full-tune with the extras (not including the shroud) is not worth it. The only thing that is noticeable and beneficial is the slightly better trigger. All the other mods don't do as much, if anything, at least I can't tell, except for the added power. The hammer-slap mod, the O-ring mod (inside the valve), the vented frame, vented bushings, (mated breach slide, polished breach, etc.), heavy durometer breach o-rings, etc.. probably help somewhat. I just can't tell. The gun is maybe slightly more quiet at the same power as the other Condors. The only thing you will be able to tell is probably the trigger and the safety which he polishes a little, and the extra power for sure. But my other Condors have very nice triggers from the factory, and are also plenty powerful in stock form.. so I am not a big proponent of all those mods - for the money. If the tune cost $200-250 then yes, but at twice as much, I just don't see it. The difference is barely noticeable for all that $. The Condor is more than fine to shoot out of the box. If you need extra power, just throw in a heavier hammer and you are done, but I would not go over 90 grams. One accessory that is a MUST, is a good shroud because they are very loud for backyard shooting, and the tri-rail is really good and inexpensive, to strengthen the frame and raise the scope.