Massachusetts, where I grew up, had machine gun shoots every year, open to the public. It was a blast. Machine guns are some of the most fun ways to blow money REALLY fast. As for the video, I've heard of them before. That's some SERIOUS money there. Class III firearms are very high-dollar items. Especially the larger ones there, like the M2 and such.
If you have never shot full-auto and a machine gun shoot comes near you, GO! It's worth the money. I personally got a chance to shoot an MP-5, BAR, and M-60 (I've shot M-249 and M-240G with the Marines).