As a long time Boosted Board fan, and someone who's underwhelmed by the current crop of rental scooters, I'm interested to try this.
I'm also somewhat surprised Boosted Boards themselves haven't released other light electric vehicles like scooters and bicycles. I'd guess the market for non-skateboard electric vehicles is much larger, and a lot of the expertise they have should transfer.
I think a lightweight (~15 lbs) commuter scooter with ~5 mile range, ~16 MPH top speed, maybe an integrated charger and shoulder sling, and Boosted Board's design and quality would kill it.