I bought a Xiaomi scooter in June and received it a few weeks ago. I live in Williamsburg and work in SoHo/Chinatown, and my commute is 15-20 mins compared to 25-30 on the subway (L -> NQR). I obey biking rules and only push if I am on a sidewalk. I haven't felt unsafe outside of riding at night in Brooklyn and not feeling visible enough. Overall it's been great, but can imagine it getting out of hand if they were readily available. For example, I was at the Farmers Market in Union Square last Weds a couple of people were riding powered scooters through the crowd clearly NGAF.