How much motorway riding do you do? At 70, it's fine, no real discomfort - especially with the SMs more upright position. If you push it, at 90+ the lack of wind protection sees you having to lean forward a bit, but the bike feels perfectly stable. I imagined I topped it out at 119 and you need a bit of a strong neck at those speeds, but still a lot of fun.
As a commuter, a SM is fantastic on city streets - its thin profile is perfect for filtering, and its light weight and big single gives it fantastic engine braking. The 701 (and 690SM) has obscene amounts of torque, so fantastic for accelerating away, or overtaking.
I've had mine for a year now, and still grin every time I ride it.