I own a 9015 HP ONE FT, as well as a handful of other Anschutz PCPs. They're all relatively the same internally after the 8001. I've been inside all of them, and feel I have a pretty good understanding of what it takes to get one truly match ready.
The rifle (like any with a two piece action design in my experience) will exhibit POI shifts, unless you get a bridge style scope mount (that's what I've gone with) or a mount that attaches to the front half of the breech only. Both work in solving the two piece action shift and are not too expensive or difficult to deal with. A rail can be had domestically from M-werks for around $100. If you want to go to AJP overseas, they're a bit more expensive once you factor shipping.
My major issue with the rifle is that the velocity will shift with temp changes. This is due to the rather small post reg volume in the factory configuration. This is something that has been documented as far back as the old 2020 and 2025 models. Still a relatively easy solution, open up more post reg volume....that was a fun project in terms of determining how much to open it up and the resulting stability. At this point, I've had the same volume opened up on 5 Annies I owned and it solves the temp sensitivity. Just as an example, stock a 9015 HP will drop about 50 fps if the temp falls from 70F to 40F. Once modified, with the reg and hammer spring adjusted accordingly, the shift is less than 10-15 fps in the same temp drop...which I would consider normal for most other PCPs.
Hands down, best trigger I have ever owned. Rifle is super accurate, and extremely dead to shoot which I love as well. The adjustments are everything you could want and more, though because of the vast amount of adjustments, it will likely take more time to get set up just right. Despite the adjustments, machining and experimenting I had to do to get the gun to a point I was truly happy with it, I still enjoy shooting it and would put it up against most other guns performance wise. For what a new one costs in the US, I wouldn't even consider it. For what you can get the gun for overseas, it's certainly worth considering, though you'd want to factor in a few hundred dollars more for the modifications/parts. Personally, if I was going to start over and do it all again, I would find a used 8002 s2 or 9003 for a better price and modify it.
If you have any other questions, or want more information shoot me a PM, I'd be happy to help.
Tyler Patner