Things I liked: It's reliable, inexpensive, and has crystal clear visual of target. I use it on my Crossman Quest 1000 and put over 2000 shots through it and it still works like a charm. I'm able to humanely kill house sparrows(invasive species of bird concidered a pest) at 50-60 yards with ease on the first shot everytime.
Things I would have changed: the elastic cords on the lense-covers lose their strength quickly and becomes useless. The elevation and windage dials would be great if they were nobs so you could adjust it with bare hands.
What others should know: The elevation and windage dials require a flathead screwdriver.