Brand New in box newly re-designed Benro B-4A Ball Head. I only mounted it on my tripod once. I have used RRS, Kirk, Linhof, Acratech, and StudioPro, and this is in the same league. It's precision made, smooth, and locks tight enough for you to sit on it without any droop.
I love it but I didn't realize it was such a big ball and I am going to use their smaller version. For anyone who has weight concerns, or wants wants a stable, large diameter ball for macro work etc–this is it!
Benro has re-designed their ballhead line and has received great reviews. You can see information here: