Pricy, but oh so worth it. The staff is very friendly and will make sure you are handling the guns safely, as well as giving you firing tips and being very pumped up about the prospect of firing fully automatic weapons. Imagine Randy the Macho Man Savage saying, "Yeeeahh, now we're going to fire the AK-47, keep your hand on the front grip and kill that Osama target, oh yeaah, shoot it in the head, ooh yeaaah!"
You buy your time by the magazine, prices range from $25 to $45 per magazine. If you go with a friend you can swap weapons, but you have to expend the magazine before swapping so you'll each have to buy 2. I fired the fully auto M16 and fully auto AK-47 and that was a crapton of fun.