No experience with that specific Cullman product but I haven't been impressed with other Cullman products over the years however. You'd be better off looking for a used Arca-Swiss B1 Monoball on eBay or elsewhere or an new Arca-Swiss p0 and adding a full width Arca-Swiss compatible clamp. The Cullmann uses a spherical ball while the B1 (and Z1) use an aspheric shaped ball. The ball shape is a major contributor to the much higher load strength and it is nice to have the built in braking with any load as you tilt away from the vertical.
