So, I took it for a blast on a piece of tar road that is no longer used and closed off, did about 20 or so up and back, up and back… each run around 1km 
It works awesome… goes good and stops good… not too scary to ride. One thing I have noticed is that you stand very high… scooters (that I have and have ridden) tend to have your foot level only 2" - 4" off the pavement, however, this one, the deck level is about 7" - 8" above the road. It is not terrible, I just noticed the height. It is a bit daunting when cruising along standing so high… not the handling, it is quite well behaved, not really any wobbles at all, even at full speed in ‘eco mode’ the slower mode.
I was not sure how fast I was going, I was there for a couple of hours… I tried to download a speedometer app on my phone, but I am useless at phones and apps and all of that and there was no 4 year old there to show me how it was done, so I got the GPS out of my car and held that in my left hand whilst also holding the handle bar.
The GPS needs to be plugged in, naturally, the batteries are useless in the NavMan… but it will work for 30 seconds before demanding to be plugged in.
So, full speed on ‘low mode’ is a nice leisurely 30 kph… which is very comfortable and easy (not scary) and once ‘letting it off the leash’ and clicking out the ‘turbo’ button, one has an instant reaction of nearly pooping one’s pants… it takes off like a cut cat! (from 30kph) 
The GPS shut down as I was passing 47kph… so I backed off and went back to eco mode. I am sure 55kph will be close to it’s top speed as advertised… I just wasn’t going to push it as I was holding the GPS, not wearing any protective gear other than my helmet… on tar, standing 8" off the ground… I was ‘kinda nervous’ 
I did closely inspect the front folding handle and mechanism to make sure it couldn’t somehow fold up at warp factor 9… but really, it is very solid, very stable… and very fun! 