kawika808

To each his own, but many would not feel that a kit is the best way to go. My personal choice is A2B Kuo. Good speed, power and range. Folds to about the same size as a Dahon Speed 7 (very similar frame), light in weight as far as e-bikes go. I'm a senior, legally handicapped (mobility issues) & lots of arthritis and this bike is perfectly manageable. I wouldn't want to schlep it up more than one flight of stairs without a break, but it's manageable. Going down, I use gravity, and use the rear brake to control the bump from one step to the next. I also considered eJoe but it seemed a bit ad hoc.
Edit:
Rather than the stairs, I usually just fold mine and stash it in the back of the car.