I've been using the Rapid Pivot system for at least seven years now. Used to be Stoney Point, then Pole Cat, now Primos. The weakest link is the rubber yoke, it tends to wear out and rip. If you contact them they sell them separately fairly cheap. I ended up buying four extras so now I have two sets of sticks with a spare yoke each. An attachment button on every rifle I hunt with. They're really handy.
They used to make a prone/bench version of the sticks. I've been looking online for awhile and can't find them, I think they discontinued them. Really wish I would have bought a set. Maybe I'll contact them and see if they have a pair stashed away somewhere.