I am a regular at the HSC. Just went yesterday to the 200 yard line, lucked out with the weather. Didn't rain while I was shooting, wind picked up heavy later in the evening though. Those seem pretty nice, for the price I like vltor products though, I think the vltor emod stock is comparable product for half the price. I had the emod with a5 buffer system on one of my ar15's, it was nice but will pull beard hair.
Another range is in the worxs for our area, 600 yds. I believe it is located in Lecanto, Fl , great for me 10 min. drive time.
http://outpostrange.com/#