With the Gyb Easy you set the tension with the number of wraps. If you set sufficient tension to slow down the boom movement does that make normal mainsail adjustments harder? With the Dutchman you can adjust the tension from the cockpit but it seems with the Gyb Easy you have to re-rig. Am I correct?
According to the video, there are some control lines that lead back to the cockpit, to winches or line stoppers. Unfortunately, the video doesn't really explain what their purpose is. Presumably, they provide a means to adjust the tension from the cockpit.
I like the simplicity of this concept, but watching the video I wonder how well it works? The jibes they were demonstrating seemed quite a bit faster and forceful than I'd expect with a brake. Also, it annoys me somewhat that I'd still feel the need to use a preventer after spending all that money.