I took a walk around Shenzhen downtown last weekend and all buses, cars and motorbikes are fully electric. It was super quiet, felt like walking in a city of the future, but also a bit unnerving as you don't hear them coming, or unless you're used to it I guess.
I also met a pair of really chaotic bicyclists plowing through the pedestrian sidewalk even though there was a proper dedicated bicycle lane Right There. Also the Metro had like 80% of ticket terminals out of order and somehow there was still smog when looking at the city from 541 m up in Ping An Finance Center. And city planning is not very town-like, it's point towers on big plots.
So, pros and cons I guess. =)