In reply to Chris L Hill:
From last year, Loch Ness is now classified as DH ( ie downhill ) on Power of Ten, and your time wouldn't count towards any of their rankings - which may or may not bother you, but thought I'd mention just in case.
I've not ran it, but know loads who have - although it's net downhill, there are a couple of not insignificant uphills, and combined with the battering the quads can take on the downhill sections, most folk reckon you're better with a flat course.