I shipped the Cassette back to Irvine (Shimano America). We'll see. In the meantime, I ordered an Ultegra cassette through my trusty LBS. Should be here in a day or two. So I'll be able to ride, but may get back the new (that is, properly designed/constructed) Dura Ace cassette. I like Shimano stuff, and so I hope that they live up to my image of them. Will advise.