As the above have stated.
Mine blew it's air tank after the second week, four days at AA & it's been faultless, week to week out of the hard case the zero stays true, scarily so to be fair.
I shoot HFT with mine with no problems apart from trying not to mark it, as you say it's a nice bit of kit.
I bought UKNeils kit from him so it's lighter but apart from that it's as it was from new.
It will do one hole groups all day if you get a good un, try the 4.53 ammo.....stunning.
Good luck with your shooting.