Things I liked:The stock along with the fit and finish is very good. The bluing on the barrel was above what I was expecting. When shooting the power and tight long range groups are excellent. My S510 has now consumed over 1,0000 JSB .25 flawlessly and has exceeded my expectations. The Air Arms has good balance when holding it which makes it an easy gun to shoot when standing. Things I would have changed:Power knob should have a way to be tightened. It can be moved to easily. When spending this much money I think 2 magazines should be included. What others should know:For the money this is the best gun under $1,000. I have two friends who both told me they own an S510 and also own several other PCP's so they knew from experience which gun to try to hook me with. They said I would thank them later and I have many times over for such great advice on my first PCP purchase.