Things I liked:I mounted this sight on my Crosman 1701. Solid all metal construction--no plastic! Windage and elevation knobs have a positive 1/4 MOA click adjustment and are lockable with set screws. If your are applying the marksmanship fundamentals, this sight will move your groups exactly where you want them. Things I would have changed:I would change screw on top from a slot to an allen or torx What others should know:When mounting the sight, the screw on top needs to be snug but not tight--just enough so the dovetail block under it can still move. If not, any slack will translate into a cant to one side when the side screws are tightened against the dovetail block.