The release plate is made of metal with a rubber pad and looks very solid. The format already shows that you have thought of large and heavy photographic equipment here. A camera system loses almost on the surface. It's a very good idea, the same resolve two of these plates can be screwed, because what good is the sophisticated system, if the conditions for a "quick" change missing and you just have to get yourself an additional adapter. Such a camera is replaced quickly and seated but thanks to the additional locking screw completely without play on the tripod. That's interesting with large lenses particularly with heavy equipment for which the instrument is designed according to the information, too (10 Kg).
No, there is really nothing to complain about. About the weight of almost a half a kilo could discuss course, but who is to buy an accessory that usually knows what he's doing and takes the impact on his equipment in purchase to add rugged durability.