I should add that there are differences in max torque and support levels in the motors in Vado 3.0, 4.0 and 5.0.Well said. The way I look at it is that the 3.0 is the "value" option - good, solid components at a "reasonable" price (if $2700 is reasonable). The 4.0 and higher take a good bike and turn it into a really good one. As someone just starting out, the 3.0 serves my purpose well - rides great, plenty fast, decent range. I bet if I had been able to test ride a 4.0, I'd have been tempted. As I was only able to ride 3.0, all I know is that I absolutely love it.
I also think I can say that I’ve noticed the improved efficiency from the 1.3 motor. My range with Vado 5.0 has increased a little more than what I expected from the bigger battery. I had a 4.0 July - Oct. 2018.