Electric bikes are the great "equalizers." If your partner is a strong cyclist, and you're not, the e-bike allows you still to ride together--faster and further. If you're afraid that you'll be the slowest cyclist in a group (rarely the case), the e-bike gives you the confidence to keep up. Or if you just want to take it easy on a more challenging tour, the e-bike comes to the rescue.
Electric-assist bikes provide power on demand, responding to and complementing your pedaling speed and power. The harder you pedal, the more power the engine gives back.
More about e-bikes
Tours with e-bikes