I run the 10k route.
Not often you get to run in the grounds of a royal castle. The race starts in front of Balmoral Castle and goes out for c. 3km before hitting 'The Hill'...you soon know your on the hill...it is a 45 degree angle for about 2km. You know your at the top when you hear the Bagpipe player. It's a gentle 5km run down hill through the forest back into the castle forecourt to the finish. About 4km you can see the finish line as you run along the top road, the atmosphere is electric.
Support is only around the Castle as it's difficult to get to other parts of the course but the marshalls cheer every runner. There's no good bag filled with leaflets etc but the t-shirt and medal each runner gets is worth it.