Hard to just drive on?  None really.  Hard to get close to WR?  Can be quite a few.  Put up a server of FZ5s at SO5R and you'll see.  GT1 at AS5.  Sure, sounds like a piece of cake, but to get that last half a second is just unreal.
Westhill is more of a mental track IMO.  All about setting yourself up for the next corner, and keeping momentum.  Great track, sucks it only has one configuration.