My experiences come from a year of scooting after a knee injury sidelined my first love of running. The major plus for me is that I’ve been able to get back to the running, but if anything I’m scooting more as well - it gives a very similar sort of experience to running, and also involves a lot more of the body (like back and arms) if you want to put in the effort. Of course if you don’t want to flog yourself you can go along easily and put in walking level effort instead.
Brakes? V brakes on my Yedoo Trexx, and there’s a project I’m building at the moment which will have Avid BB7s.
Speeds? To put in my own figures for mac’s infographic, I will walk 2.5 miles or so in half an hour, run 3.5 - 4 miles, and on the Trexx cover between 5 and 6. Roughly speaking for a given effort I go about 15-20% further on the scooter compared to running. Furtherest I’ve gone so far is 13 miles.
The physical similarities to bikes is very misleading. Apart from that it’s very different from cycling. Which is why instead of thinking of speed in MPH I think of it in mins/mile. The great thing about that is that I get to feel how quick I was running 25-30 years ago. The fact that you have your feet contacting the ground, the leg action, constantly changing stride to adapt to conditions, the effort level, all make me feel that it is very similar to running.
You won’t get far if you only use one leg - it’s the standing leg that tires first, and not the kicking leg. I swap every 6-8 kicks, less if it’s uphill. The changeover (the footboard is just wide enough to accommodate one foot at a time, to save on grounding in corners) becomes automatic after a while, either a shuffle change as mac described but there’s also the racer’s jump kick where you jump off the footboard with the standing foot whilst the kicking foot comes into position. I have found this challenging to learn (ending up with both feet on the ground!
) but it has its uses on climbs when you’re going relatively slowly and want to maintain momentum by keeping the propulsive force going with minimal interruption.
My Trexx spends most of its time on forest trails, when I got it I deliberately wanted something that could cover the same sort of ground as I go when running, and it can pretty much do so. If the going gets too rough at under 8kg it’s no problem to carry or shoulder. My plan is to orientate the Trexx more to off-road use and the project machine to be more suitable to tarmac and light trail use, though as it is it’s very adaptable. Like bikes you can get scooters for racing, for touring, for forest, for commuting.
(turned 70), don't like the traffic any more, & want to get back to getting some worth while exercise again, so am looking for other like minded members to bring this thread to life. 
