This is a good solid unit, but you need to be careful how and where you set it up. At 17 feet I got a substantial amount of lead blow back (.22 short rifle), and without eye protection you could end up with a serious problem. 
Pros: Easy to use, and great for practice.
Cons: Substantial lead blow back at a measured 17 feet, you need good eye protection at the very least.
                    
This review was written in the old system and had content requirements that are different than reviews written today.