Bought this for F-Class and boy was I surprised how great it worked. Glass is exceptionally clear for the high magnification. I usually keep it between 30-40x depending on the mirage and it really helps you dial in on the x ring. I actually had it on 60x at 1000yrds this weekend but the conditions were absolutely perfect. I used it to shoot this 800yrd target 2 weeks ago. I'm a novice at F-class so I was pretty happy.