I own one of these spider rigs. It's not too bad, the price has come down. I have used a couple of those Redrocks and Letus mounts, and I say forget them. The rigs alone are so heavy, they will almost break your back if you latch on to them the whole day. To be honest, I'd come over to the DSLR game because I wanted to ease myself of the burden of ENG dinosaurs. I might as well just go back there if the rigs are so damn cumbersome