If you haven't ever used one its nice because it pulls down the back of the camera keeping it locked in tight.
Sometimes Sony plates have a little play in them and the camera ends up wiggling a little bit if you tilt too far. This plate keeps it pretty secure.
It's a $1080 on B&h. I would like to get. $ 700 for it.
Pm me if your interested.
Here's a link to the B&h page