I purchased the Spider Pro single camera system system with their belt and I have had it out a few times. I am really pleased with it. I HATE straps around my neck, so I found I often wouldn't take my camera when we would be walking or hiking as the strap around my neck would bother me.
With the Spider Pro, the weight is on my hip and I hardly notice it. I have a generic lens pouch for my telephoto lens that I put on the other hip.
I am one of those overweight people. It did take a bit of adjusting to find the right position for the belt so as not to pull the pants down, but it was fairly easy to do. The belt definitely needs to be tight.
I'll have to see if I can hook my binoculars to the belt as well.
This has made a huge difference in my enjoyment of this hobby. I highly recommend this system.