Read an e-bike review just the other day. The author said the less one pedaled, the more the electronics+motor assisted. I'm not familiar with any bicycle where the result is disproportional to the rider's input.
Without having tried one of these pedal-assist bikes, this is really what I'm curious about. With one of those Spesh ebikes for example, can I appear to be pedaling and putting out maybe only 20 watts, but still get the bike up to 28mph?