When the 3rd edition was first published 2011 the digital edition was not immediately available. Don’t quote me on this as I could be wrong about that, but this is what I recollect.
I purchased the first edition hard back shortly after it was published in 2005. The 1st edition was my first book on MPLS. It was also the first technical-read I had on the topic of MPLS (no Internet material or vender technical publications before it), only small chat and hearing others drone-on about the subject.
I hope the 3rd edition is as good as the 1st edition.
For reference, there is a 2nd edition but I did not read it.