I have the unregulated US in .177 and I can’t speak highly enough of it. It’s my main nighttime hunting rifle and has taken hundreds of rats and rabbits. I’ve owned it about three years, it’s been no trouble and is easy to maintain.
I looked at lots of PCP’s and the US had the best weight, balance and ergonomics for me. It’s a good looking rifle too. Accuracy is excellent and one hole groups are effortless with JSB Exact and Exact Heavy.
Shot count appears to be higher than advertised. Last week I had a good night’s ratting and with around 40 rats down I still had 100 BAR in the tank.
I fitted a Picatinny rail for easy switching between NV and scope. Rowan Engineering make a quality one shot adaptor if you want to use it for competition.
You won’t be disappointed with a US.