As an Aspiring glider pilot, and hearing all the folks at my club talk of Pigott like a deity, I decided to grab one of his books as a reference... Not knowing which one, I picked this at random.
Normaly, I'm a very "theory" based person, but this book was a bit much for me... It doesn't really start from the beginning. If you're an Ab-Initio, I'd recommend Gliding: Passenger to Pilot for the first few lessons, and then maybe as you get very close to solo, this book might be suitable.
On the plus side though, one of the Anicdotes in this book was very useful... I wasn't comfortable with well banked turns, prefering slow shallow ones, until I read an anicdote in here where a very well banked turn saved his life - if anything, its more safe than shallow turns.