I also got the TAAO digital files the other day (the TAAO Compendium is basically my anniversary/birthday/Christmas gift for this year) and have cataloged them in my comic collection and started reading it last night. A couple things I noticed:
* The copyright page of Volume 3 omits the fact that it collects UK #198-205 (Time Wars)
* I was slightly surprised to see that everything that (presumably) doesn't fit the main US/UK G1 narrative got shoved into Volume 4: Earthforce, TF & GIJoe (since it conflicts with the UK origin of Goldbug) and all of the G2 stuff.
* I was even more surprised that there were no editorial notes or explanations or anything, just the stories presented by themselves. Not even back cover copy to tell you what it is you're reading.
Still a pretty sweet collection, and the hardcovers (when they arrive) are going to be amazing.