Visited a friend up in Truckee who he and his wife commute daily on their ebikes. We rode the town together and I gotta say the EBike is the biggest thing since the bicycle. Ok you don't get the same exercise, but you can ride farther faster, so tend to take the bike more often.
As someone who will be using a non-e bike until my body needs to switch, I strongly believe that ebikes enable exercise that may not have otherwise happened, and this is just as good as non-e cycling, when considered across a population.
