This is a U-lock with an added U that slides onto the shackle. I just am not getting how this is an improvement. I see how they use it (1:30 in the video if you want to skip ahead), but I don't see how it adds either convenience or security. And, if you're going to crow about how you made a lighter lock then why would you turn around and add another shackle to it?
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I did notice in all their videos they are putting both wheel and frame inside the shackle, rather than capturing just the wheel but within the rear triangle. Their current solution to the front wheel is to sell you another lock, rather than have you put it in the lock. They do still sell the longer locks, though.