my opinion - its not the bike for two up riding. The power is there but the comfort for both rider and pillion if seriously lacking. The 690 is a very special bike with exceptional power and handling for its class but two up is just a waste of its talents....like using an RC8 R as a commuter bike
I have taken my wife for the odd spin on mine. shes not very big but still complains about being squezzed for room and it becomes uncomfortable after an hour or so. I have modified the stock seat for more comfort but thats all.