I used an electric bike kit from
Golden Motor.
Have been pretty happy with it. I think it was a little cheaper when I bought mine.
In a lot of states, electric bikes are supposed to go no faster than 20 MPH under their own power. So a lot of manufacturers design them to go that speed.
My cheap frame didn't have any suspension on it. Pretty scary when I would get it over 30 mph going downhill.
People also didn't expect me to be going that fast on a granny-cycle. Cars would pull out right in front of me all the time.
That's a big part of what led to me doing the electric motorcycle - suspension and street cred.
Electric bikes are fun - definately do it!