I agree that the bobbin is incredibly smooth and well-made. I have 2 problems with it. At least on the trout sized bobbin with the ceramic insert, no standard bobbin threader will fit into the nozzle. As a result, I'm forced to slide a floss threader up the tube, which, given the design of the bobbin, ain't easy. As a result, I find changing threads a pain. My other beef is the asymmetic weight of the bobbin. I spin my bobbin a lot to flatten the thread. This bobbin does not spin as easily or rapidly to untwist the thread. I wish it were counterbalanced, which would make it heavier, but spin better.