It's from Ninebot, a Chinese company that bought Segway a couple years ago. They seem to be one of the biggest e-scooter manufacturers, including many sold under other brand names. I think the model he has is F40.

The biggest drawback he's found is that the top speed of 19mph is a little limiting on the roads with painted-on bike lanes where he rides, some where the speed limit is 35mph so the speed difference is a little uncomfortable. I think that's a result of many cities restricting personal electric vehicles to conform with the 20mph top speed of a class 2 electric bike, so e-scooter makers just impose the same limit. His city bans rental e-scooters, but doesn't regulate personal e-scooters at all, so he may end up selling it and getting a faster one, or just hacking the controller to raise the speed limiter.