After some time looking at it on maps I went up to paddle the River Dee last week. I only did a 75km stretch, but I reckon the section I paddled is probably the most “natural” stretch (as far as the banks and the surrounds go). The biggest of the white water is still to come at the point I took out, but it also gets more agricultural as you carry on down.
There is a lot more potential for trips involving the to take in parts of the Cairngorm Mountains, it is a river I plan on visiting in the future. Put simply, it is a great river with lots to offer for a packrafter. My trip report and vid are here:
There is more info here: