Yes the GTX brings a whole new meaning to Gamo after it is installed, especially after shooting a while with the stock Gamo trigger. I to sent my first Gamo to CharlieDaTuna for a Turbo Tune and GTX trigger. I had been shooting the S1k for a month or so stock out of the box.

I thought to myself.. Its got to better than this..

Then after finding CharlieDaTuna I contacted him as well.
CharlieDaTuna is an exceptional individual and I don't think all air gun smiths take it one step further like Charlie does. He has all the tools of the trade in his shop, and I might add very organized and clean.
Well after that first tune and GTX trigger, I have bought 7 more Gamo's and all but two have been touched by Charlie. As soon as he has time, I will be bring them over for that magic touch.

The CFX Royal .22 that I bought from UK keeps calling Charlies name... he he...It has not been touched or fired yet.. It will get the new GRT-III Trigger.......

All my Gamo Air Guns, I do targets with them and shoot squirrels, and I am very pleased at the performance of all of them..
Gene