Things I liked: It works for my 1971 Benjamin Model 347. It use to not even hold air over night now it holds air and dose not seem to be leaking. Planing on getting another one as a spare.
Things I would have changed: I would have liked a lead washer instead of the replacement plastic washer. I did not use the plastic one. i reused my old one.
What others should know: If your gun has not been apart for a while. It may be hard to remove the valve guide retaining nut.
Things I liked: The nitro piston is a good selling point. I like the dovetail for the rear sight so you can add a red dot or a scope. i also like the weight it is a little heavy but that's the way I think it should be it does not feel like a toy or as if it will fall apart in your hand.
Things I would have changed: I think that the cocking assist should have been part of the barrel. The trigger could be lighter or adjustable.
What others should know: I put a red dot sight on mine. The trigger takes time to get use to it. I have killed 2 rabbits and 5 squirrels with it. I have shot about 500 pellets out of it. Just practice and find the magic pellet for you gun. Have fun practice makes perfect.