This is NOT your standard compression clamp. The AC42 Extended version features a highly robust design, strong compression, and allows for a greater range of motion when connected to the Arms or Light joints. Also, you can attach a lanyard, or line with snap to the clamp for additional security of your system.
The clamp itself allows for greater security when screwing down the handle as one side is not affected like a standard clamp. Given the wider assembly, and the redesign of the ball joint seat, you'll have a stronger hold and more flexibility.