Had my first crash on this bike. Right at the 500 mile mark mid-November. Sand had blown all over the bike path and I took it too fast. The bike did ok, but when I picked it back up the motor wouldn't work. I pedaled the rest of my commute and got a ride home. I suspected (and was correct) that the left brake lever was bent and the motor was not able to engage because it thought I was braking. I was nervous muscling it back, but it wasn't bent too bad. So that's what I did. And I also took the time to replace both wheels, inner-tubes, and give the bike a cleaning. The front wheel was still ok on tread but the back wheel tread was completely gone. Changing the front wheel was easy. The back wheel was more challenging because the motor cables and disc brakes. Ended up leaving the wheel on the bike and just moving it slightly to get the tube and wheel in place. Ended up just being more annoying than difficult. The chain cleaned up nice with some Simple Green. I haven't ridden on the commute nearly as much with me feeling a little more cautious and it getting dark so early (I don't need to wipe out in the bike lane into traffic...) All is well though. Have had zero issues with the motor since bending the brake back to its (or close to its) rightful position.

Today’s electric bikes come in a variety of sizes and styles,  many of which don’t look all that much different from traditional non-electric bikes. When you consider it alongside the annual costs of fueling, insuring, and maintaining an automobile, an ebike literally pays for itself over time. Here are five of the best electric bikes currently on the market — and one “just for fun” pick.
E-bikes mostly use motors and battery options from a few major suppliers: Bosch, Yamaha, Shimano, and Brose. A few other brands exist, but are less reliable or powerful. Some, like the Yamaha system, have more torque, and others, like Bosch’s Active Line, are nearly silent. But, generally, all four make good options. Look for motor output (in torque), which will give you an idea of total power. Just like car engines, more torque equals more power off the line and more boost to your pedaling. But watt hours (Wh) is perhaps a more important figure to use—it takes into account battery output and life to give a more accurate reflection of power (higher Wh equals bigger range). 
What's The Best Electric Mountain Bike?