Things I liked:The nitro piston is nice. This gun is accurate and strong. At 25 yards with the .25 cal it was putting rounds in a quarter sized area and through an inch of plywood. Things I would have changed:Its a little heavy and long but once you get used to it, its not that bad. Keep the bi-pod and give us a better scope! What others should know:If you are looking for the best bang for your buck, this is it!!! It comes with the spring that Pyramid pulls out of it so if you are worried about the nitro piston going out, you have a back up. And so far, the Predator Polymag and H&N Sport Silver Points have been the best out of the 5 different pellets I have tried. They were scored on penetration, expansion and accuracy at 25 yards. A buddy of mine got the same gun and bullets, got the same results.