Having gone from a 660 Tenere, up to a Super Tenere and back down to a 690, I can tell you all you need to know

The 690 is a purpose built bike and that purpose aint open road cruising. It's got stuff all wind protection and although the new models have a better seat, it's still not great. It's also got a pathetically small tank, good for 200km's only. The result is that riding to the play areas is not the most pleasant experience.
It is however awesome on trails and general gravel road, unmatched really and with so much power you can lift the front over most things rather effortlessly. It's also great around town because it's narrow and weighs nothing so very easy to throw around.
As an adventure bike, the 660 Tenere is the better option. It doesn't have the power or suspension of the 690 but it's got enough to get the job done and it's got a very respectable fuel range.
As a Trails & play bike, the 690 can't be beat... neither can it be beat for the Grin factor, your teeth get cold riding it
