Cheers for the info. I picked up a new ER6N today so of course it is abs equipped.
I too found the rear kicking in twice already, once coming down doi suthep,(I was trying to bed the pads in) and another when under braking the rear got light over some bumps. If it kicks in it must mean it was starting to lock. Without it you would just get used to the point where it started to chirp and that's it, with abs you can be as aggressive as you like. I did notice pulsing in the pedal, I guess the fronts the same? Some systems you don't feel any pulsing.
Either way, that ER6 has good brakes, 2, 300mm rotors with 4 pot calipers, a lot of 650's would have just one rotor.