Originally Posted by
unterhausen
that's interesting that he designed it. The difference in accuracy is questionable in my mind. And the disadvantages of the design from a mechanical viewpoint outweigh them.
Maybe those are the reasons the design didn't stick around. Brandt reported that at high speeds, the one-magnet design would give spurious spikes, which is why you see people claiming speeds of over 50 mph. I don't know if he's right, but even if he is, it happens rarely enough that it's not a big problem.