I owned a ZEV, a terrible scooter. Nothing but regrets.
Pieces are poor quality, assembly was haphazard, using zip ties and tape, things caught on fire, and the company did everything it could to assign culpability to me. I can give a list of specifics if you want later, I'm on my phone right now.
In terms of ability, the scooter just doesn't measure up to the specs promised.
After spending several thousand on a lawyer and getting to ride for about a month total out of the year I owned it, I sold it for a thousand dollars to a mechanic who will probably part it out for other projects.