Things I liked: The look. It looks great on my all weather Benjamin Trail .22.
What others should know: It is not holding a zero. I get it sighted, it shoots not too bad for about 50 shots, then I have to sight it in again. I will not use this for pest control; I do not feel I can trust it to get the pellet where I'm aiming at, and the problem wasn't truly identified until after Pyramyd Air's return window had closed. I really feel like it was a waste of money.
Things I liked: Free air. Easy to use. Came bundled with the Discovery.
Things I would have changed: Add moisture filter.
What others should know: Do NOT pump this fast like a bicycle tire. Take it slow, pause for a few seconds at the peak & dip of the full cycle to allow the pump to work at top efficiency. The Discovery goes from almost empty, to 2000psi in about ten minutes, maybe 100 strokes. You'll get a workout, but it's a cheap & easy fill. If you live in a humid area, close the door & window(s) & turn on the dehumidifier.