A68, just be aware of the 9 cameras, (7 southbound, 2northbound, or is it the other way round!) when u see the camera sign, it is within one mile, so be sensible. Otherwise a fab and usually fairly empty road. Just b a wee bit canny at times, cos there are a couple of tricky bits.
Do it at nightime, when you cant sleep and jus gotta drive, it will leave you breathless.
Cheers