Had two different experiences with NCS, first time going brilliant had a great time though it seemed unorganised.
I've seen two sides of the story as have retaken AS levels, and this year seems to be in tatters from what I've heard an absolute lack of communication between NCS and other students/their parents.
As I've gone once I had phoned them up to ask if I could do it again, they said I could but by only paying a fee. Of which case they didn't know at that time and said they would get back to me.
Turns out they never got back to me and quite frankly don't listen to individuals like myself and other students.
Nevertheless the first time I went it was really good, I went to Barton Hall in Torquay, tho never felt like NCS really were involved in the whole period we were away and were a bit on the side.
Hope this helps!