I know that some people have noisy gears . My gas bike has a lot of gear and chain noise but the motor is so loud you would never hear it (and It is quiet for a gas Bike)..
My rear spoket is a little out of round .( in spec though, said the dealer) so it has a slaping sound quite loud much louder than any Vectrix.
Any way here is a link to a nice EV VFR . http://blog.evfr.net/ watch the Video . he has done a great job . but the chain is loud.
Vectrix seams way better than this .