Just wanted to post an update. I bought a set of Worksite Pro pallet forks from JD. Love 'em! If you are considering grapples for moving brush and other items you should consider the pallet forks first and see if they will do what you want before going to the extra expense of buying the grapples.
I'm not saying that forks will do everything grapples will do. They are different but for my needs right now the forks do what ineed and my cost was less.
I've moved some concrete slabs, brush piles, implements, stacks of old posts, stacks of old lumber, debris......nothing I absolutely had to clamp down on to control while moving.
They are a great help to me and I might could have gotten a set cheaper than the $750 I paid but I consider it money well spent so far.