As a user, I'm quite fond of them! The bus terminals are starting to smell a little bit less than burnt up diesel fuel, as well as the immediate sound pollution, when waiting, is a godsend.

They make a funny noise when starting their roll (the sinusoidal controller for the motors do this, it can be programmed), as well as some models are a little awkward on their seat arrangement. Some models do have some EM shielding problems on the very back, so you can hear a little of the current when wearing headphones. Nothing that I think would be bad for someone with a cochlear implant or peace maker, but if it was the case, I'd recommend to err on side of caution and stay by the middle.

Oh, and some drivers have this "stop and go" cadence to their driving when on a red light and gets a little annoying, as the relays are quite loud on some models (think the light switch it your room, but crispier).

But still, way better than the old diesel models! Air conditioning has been common for a while, but it sure is better when there's no big engine in the back running extremely hot and fighting against the insulation. And USB chargers on almost every seat is nice too!