Things I liked: The overall quality of the Hawke Airmax EV 3-9x40 appeared to be good. I mounted it on my Beeman R7 with Beeman 1" medium profile rings that provide a very secure mount.
Things I would have changed: The elevation adjustment at first would go almost 400 clicks as the directions said it would. Then the second and subsequent times I tried it would only go about 250 clicks. The adjustment for windage continued to go for about 400 clicks. Shot groups would be quite low for about six shots and then quite high for about six shots. The shot groups remained centered for windage. It appeared that the center tube was changing its position for elevation, but was consistent for windage. The click stops for elevation and windage were not centered on the index line. There was not any way to adjust the settings for elevation and for windage back to 0 after sighting in. The adjustment for focus and parallax was difficult to move, and the adjustment for power was very difficult to change.
What others should know: I returned the Airmax EV 3-9x40 scope and got another brand scope of the same power that cost $190. After mounting it with the same Beeman rings, it performs vastly better. Shot groups are much closer together, sometimes forming just one hole. The adjustment for focus and parallax and for power are secure, but easy to move. The settings for elevation and for windage can be returned to 0 after sighting in. The reticle is simpler and easier to use. The overall quality and performance is significantly better than the Airmax EV 3-9x40, but id did cost $60. more.