The biggest flaw with this escooter is changing the level of assistance. On the Max, you can choose between E-Saver or Sport modes. The former limits you to a criminally low 9 mph and the latter unlocks the top 20 mph speed. I wish there was a happy medium preset that let you ride at 15 mph. You can set a custom speed in the Niu app, which is what I did, but this replaces your other speed options, so you need to toggle it off in the app every time you don't need it anymore. It's bizarre.