In reply to Chris Craggs:
On the busy or not issue, when we were there in August (we camped at the Stetind camp area at the start and end of our week) there were noticeably more people about at the weekend, but locals mainly I think. But people from all over Spain, Ukraine, Swedes etc. through the week, but it was still only a dozen or so camping there, not mobbed.
The interesting thing was that when we did it no one else did the S Pillar, everyone else was on the Normal Route, so it was quite a lonely experience. Some friends did it a few days later and again I think they were the only team on it that day too. The Normal route is more popular than I realised and possible the S. Pillar less so, although the guidebook does mention Goldfish as an alternative route when S Pillar is crowded.