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.