I was also told by someone that worked there that the whole problem with them was a software issue in the motor controller. The manufacturer of that controller would not work with them on a fix and management didn’t want to replace them.

I tried to buy a few of them for virus components but they wouldn’t sell them to me saying they had to all be crushed.

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Well at least one of them will have a rather curious revival coming up:

https://www.youtube.com/watch?v=vGyOIWl788c