The tune of my Caiman X was OK but the regulator was poorly assembled (it's a Huma} and it failed twice as a direct result. But it was just a question of getting it properly lubricated and it has been fine since. I used Weevil's Caiman fix to stop the declining velocity due to a lack of regulator stack venting. It works nicely now and has given me a 200 on the 30 yard challenge.
My experience is completely consistent with his "80-90%" observation. A poorly assembled regulator and a non-venting regulator is not what I expected in my most expensive airgun. But the fixes cost nothing and were not difficult to do. Utah airguns, I'm sure, would have at least fixed the regulator. This gun has more power than my less expensive PCPs and also is better machined with noticably nicer cocking and a better trigger. Interestingly my airgauge was also an issue initially but it was just the stock didn't give the gauge quite enough room and it kept popping the cover off. A few minutes with a sanding drum and the issue was permanently fixed.
I have not recommended a Caiman to anybody for a first airgun and that may be a decent rule-of-thumb for Air Maks in general. But if you are comfortable and capable of doing a few simple things to a new airgun there is justification in their price for your efforts.
