I have had my TX200 MKIII for a little over a month and although I liked the way it shot, I decided to install the new steel PG4 Vortek high output tune kit. I shot the gun after installing it yesterday and have been shooting it today. I have decided now I really love the way it shoots. I can tell the gun no longer has the spring twang sound and slight vibration feel after the shot. I think the cocking effort stayed about the same, maybe even slightly more, but not much. Here is a photo of todays shooting from 30 yards using H&N Barracuda round nose 14.66 gr. and the inexpensive Crosman 14.3 gr. pellet you can buy at Walmart. After shooting today I ordered 4 more tins of the Crosman pellets.