I spent way too long researching and way too little time riding! My requirements were:
Must be able to cruise at 18+MPH (29KPH). I ride an electric skateboard around that speed and it's comfortable for me to "run it out" if I need to.
Must be ~40 pounds (18kg) or less so I can easily lug it onto the train or bus.
Needs to handle my geared-up weight; with backpack, gear, & clothing, I weigh about 240 pounds.
Not the "first try" of a given wheel size for a company. Ideally they'd have one or two releases under their belts to work out the problems.
Decent trolley handle or other means of pushing the thing around when I can't ride it on my multi-modal commute.
Good reliability record; I don't want to fully "gear up" for every ride, and I'd like to have as few skinned knees as possible. I get plenty of those on my longboard...
Modest off-road capability. I'm pretty much stuck to roads on my road bike & my longboard; I'd like something I could use to explore the numerous dirt trails in the hills near my home.
Narrowed it down to the KingSong KS-16S, Inmotion V10F, or Gotway MCM5, or Gotway Tesla Found a good deal on a used silver KS-16S locally in April 2019 from a guy who recently relocated to my city from Canada, had left it in storage for months after failing to learn how to ride it on the carpet in his house, and said he'd bought it on Canadian Amazon and just wanted it to go to someone who'd ride it. My kids and I dropped it a ton, chewed up the pads, dinged up the case, and had a great time learning together over the past six weeks.
But it rode a little "weird". Tried to calibrate it. The Kingsong app wanted me to upgrade firmware from 1.07 to 1.09. It bricked itself with "illegal serial number", and the seller went silent when I told him about the problem. KingSong refused to help me with the problem and told me to take it to my dealer. Since I'd bought it used, I didn't actually have a "dealer". I asked a local dealer if I could throw some money at him to help me out. $110 later, I now have a local "dealer" who's plugged me into the local EUC community, and a working KingSong KS-16S updated to firmware 1.09. The wheel had been registered in someone else's name in Canada and they had not "unbounded" the wheel prior to me trying to register it; this triggered the "illegal serial number" issue requiring dealer service.
Overall, I'm very happy with the wheel. It's smooth, stable, fast enough for my needs and to keep up with my local longboarding and e-skate crew. I'm very unhappy with the manufacturer's support of buyers in the USA, and fear for the day that I need to update my wheel again: will it go back to riding at max 12MPH and beeping constantly the next time I update it?
If I could turn back time, I'd just save up another hundred bucks and buy one new from a local dealer. Other than that, though, I'm loving it!