Meh I find my ebike conversions one of the best purchases I've ever made.
Reasons:
-Sweat free commuting. 6 months out of the year its 85F+
-Regularly loaded with an extra 50 lb in my panniers
-Surrounded by steep hills
-Lack of bicycle infrastructure in a large city, The ability to quickly get out of the way of the cars in traffic is a huge plus.

I have about 3,000 trouble free miles on mine; and would probably never go back to a non electric for commuting/errand running.
I'd probably replace of one of my cars if I could find a Bullit Bakfiet to convert.

Its a happy medium between a bicycle and silent scooter.

For me its more about staying out of my cars as much as possible and not getting run over while doing it.