You probably know this, but make sure you have the right hydraulic quick connects. The grapple probably comes with flat face skid steer type whereas most tractors use the ag type. If you are anxious to use it this weekend, don't make the mistake I made and have to search for these connectors when every hydraulic shop is closed.
No doubt about it in my opinion. A grapple/rake is far superior to moving brush than a rake/bucket unit I have a rake grapple and it has moved at least 100 trees, all the bursh and the ocasional bolder off my 50 acres and fence rows. My grapple is on my Bobcat 863 turbo model F. It is rated at 73 hp and just under 2000 lbs of lift. The grapple is great for cleanup.