The Scoot service in SF uses GenZe scooters and they're fantastic to ride. Granted, I don't own one because I just use Scoot. They're about $4.5k on the website.
Nice. The main part of my journey is on a 40mph road though so it would need a little more get up and go. I also ride a 650cc motorcycle so the temptation to get a faster one is hard to resist!