No experience with the Bramo but the one thing holding me back on it is the idea of the 6 speed gearbox and chain drive. That is just to old school for electric for me.
I have a pair of Vectrix VX-1s and a Vectrix VX-1 Li+ and love riding them. I am planning on getting a Zero S either this year or maybe holding out to see what additional improvements are coming in the next model year.
No range extender needed here, if I am going that distance I will take something a bit more comfortable like my BMW K1600 GTL or the Karma!