Definitely had a thrilling experience and would recommend to visit while you're on vacation on the strip.
The nice thing, which I didn't know during my visit, is that they provide the transportation to and from your hotel, you just need to call them ahead of time. Since I didn't know about this, I drove over and the trip wasn't too bad - about ten minutes or so from the strip with plenty of parking on site.
The staff was nice, most were ex-military so they were knowledgeable about the equipment and shared some of their insight. I got to choose three different weapons and had to wait about an hour before they had them ready. In the meantime, while waiting, I checked out some of the retired US military equipment outside, which I thought was amusing. You get to sit on a helicopter!
When it's your turn, the little device they gave you when you signed up will start buzzing and you get to meet the instructor. Wearing both the earplugs and the earmuffs were recommended and the sound wasn't too loud, albeit was hard to hear the instructor afterwards.
I will leave it at that, have fun and enjoy your trip to Vegas!