Those bikes may be great. Probably are.
Still not a fan of the concept. It's got to add expense and weight.
For me the point is to get exercise. If the ride is too hard, I'd try something easier, not go for an electric bike.
I rode a Tesla electric bike. $3500 for a heavy bike. It was fun using the motor but when the motor wasn't running it was just a heavy inefficient bike. I ended up going purely on battery. Could have a good application as a commuter.
"You just need to go at that shit wide open, hang on, and own it." —Camp