I built mine because I can't drive anymore due to visual impairment
(only 1 eye works anymore and it is not that good)
I live with my daughter and her family (hubby <azvinnie>, and 2 granddaughters 4+6)
I take the oldest to school and her sis to the park with a kiddie trailer
the town I live in has some killer hills, and my old knees couldn't take much more of the pedalling
the motor lets me enjoy their youth and my solo rides when their mom gets home from work are the best stress relief I have found