We did the trip at the end of May and I am sorry to say that Stuart's jocular summary was not too far removed from the truth. One thing he missed out was that if you are fortunate enough to eventually get clear of the Motor-homes, you are then just in time to get in among the cyclists!
Because we had "done" Applecross several times before we drove straight down through Torridon but I would avoid this - the road surface is definitely not Morgan friendly. Petrol wasn't a problem (in a 4/4) but you won't find too many stations with 97/98 octane. The scenery, when you can see it can be spectacular. Unfortunately the NC 500 has become a victim of its own success and I would only consider doing it again in winter.