I might sound biased, but I think it's one of the worst designs out there. In order to adjust the pinion angle, you have to rotate the UCA to mount bolt until your pinion angle is good. It works like a camber bolt and makes adjustment difficult. Not only is it hard to work in that space, but damn near impossible to get a torque wrench in there to tighten everything up. You're much better off with a threaded adjuster. Threaded adjusters are way easier to use, you have a wider range of adjustment, and you don't have to worry about an eccentric bolt slipping.