Edit: Updated review to reflect 5 stars. Initially, I had regenerative braking off. I thought it would slow me down. Today, however, I decided to set it to 3, per eWheels recommendation. The difference has been huge in terms of energy put right back into the battery. This resulted in: 25 avg speed on flats opposed to the 18-20 I was previously experiencing. The biggest difference was on my local hills. Previously, I was hovering around 10-12 mph. Now I'm averaging nearly 20 up those same hills. Also, eWheels sends out a maintenance PDF. Be sure to follow it. Prior to riding, be sure to adjust the brakes and also make sure your headset is tight. Both needed adjusting/tightening on mine, but it only takes a minute. It's no big deal, but important you make the adjustments to ensure maximum performance and enjoyment, as well as safety. Specifically, make sure you brakes aren't rubbing - that will severely affect your speed.