How about "buy once and cry not at all"? I am happy with my Prod, Avenger, and 3 P35s. I also like my much more expensive Caiman. But I certainly am not crying about any of them. The Caiman arrived with the worst trigger of any of them and needed multiple fixes to it's regulator but it's shooting great now. 199 on the 30 yard challenge last week. But my P35-22 shot a 200 last year and has a 197 this year out of only a few targets with it.
It is possible to screw up any airgun. Heck it's probably possible to take a toaster apart and mess it up too. It would really help if manufacturers would put a decent amount of information in the manual but the Avenger, which cost $300, has the best manual and it is not great. Fortunately we help each other here and there are youtubes which are a big help. I also got needed help on the Caiman from Utah airguns. I've probably done the least to the avenger but I've turned the regulator all the way down and most of the way back up. I've tried multiple moderators on it and shot a bunch of pellets through it. But I've had the 25 caliber P35 completely apart including the trigger mechanism. I was literally praying I got that back together and I did. I have not taken the P35 regulator apart but I did the Caiman's Huma because it needed to be taken apart. I drilled out the transfer port, barrel port, and passage between them in my P35-25. I also put an aftermarket plenum on it. Some of these things took more attempts than others but they all got done. My point is just that while it is possible to make mistakes it is also possible to keep at it and be successful.
I appreciate the finer machining of the Caiman but that does not mean I don't also like my P35s. The cocking is a little sloppy but the trigger is not and they are light, short, and accurate. I appreciate the fact that we all get to decide how to spend our money but I think it is wrong to suggest that the result of buying a under $500 PCP is we will "cry". Or be significantly dissatisfied with the purchase. That has not been my experience at all. 3 brands, 5 purchases and they are all fine guns.