I've a print copy of this, the content is quite good but rather marred by the annoying typsetting everything is all jammed in right up to the marigns (something which is sadly true across this whole series of great books).<p>The problems however are absolutely fantastic, a great mix of computational and theoretical which go from half an hours fun to really unanswered problems. Fun fun fun! I highly recommend trying them and referring to the text as needed.