I own one and am happy with it. I have the adjustability and the ability to change calibers, even though I keep my .35 as a .35. I shoot the JSB pellets and have them at 885 to 890fps but have room to shoot them much higher.
The .35 is the step child of FX as it hasn’t been given the same attention as the other calibers. Still no slug liner after more than a year, as well as the tuner doesn’t come in that size either. No carbon fiber sleeve to stiffen the barrel but I hear there is a new barrel system coming but not sure if it will be for the .35.
Huma has a power kit for it but it really depends on what ft/lb your looking for and still keep the accuracy. NSA has a few slugs for the rifle with some having very good results with the 93gr.
There is now the barrel kits for 700mm, 600mm and 500mm which Utah Air has been offering as well as a few other vendors but they don’t stay in stock long. All and all I am very happy but would definitely like to see the same offerings from the other calibers for the .35.
As far as power goes with my settings, first reg 190, second 135, its at 145ft/lbs but with changing my macro wheel to 16 I am at 154ft/lbs.