Not sure how often they cycle out the plastic backers, but sometimes there is a lot of voids for your staples to hit. I have been putting my targets on cardboard before I go. To say it is loud is an understatement. I put on my ear protection in the parking lot when I'm unloading.
It is much safer than it was before the remodel. 15 years ago you were likely to get shot going down range to deal with targets. 20 years ago you would have trouble putting a target up around all the tv's, propane tanks and appliances.