good description Fortinbras.
the terrain is quite fast going as it is mostly on grass and tracks.two big climbs to tackle i,e Moel Eilio and Cynghorion but all very runnable.navigation is quite straightforward,obvious tracks and fence lines on most of the route ,the only real route choice is the line from Cynghorion to the Maescwm path,although this depends if there is a checkpoint on Foel Gron(some runners skirt around it)