I'm just coming up to two years of electric biking.
My Quando, bought in February 2007, which has now struck electrical problems, has 2342 miles on the clock.
The Sprint, bought in November 2007, has 2713 miles on the clock.
I also do a few miles on other bikes, so I'm doing about 50 miles a week.
Prior to the electric bikes I did 3500 miles in the year I turned 60. While I believe it was good for heart, lungs and muscles it took its toll on joints and tendons, and I can still feel the effects today. I am now much more aware of the need to listen to the feedback the body is giving and do something about it if necessary. The high power of the Ezee bikes and availablity of twistgrip control are important features for me.