This is an awesome drawing reference for those who want to be future Transformer artists. The scaling was a surprise--I hadn't realized Ratchet was bigger than the Lamborghini brothers! The Autobots and Decepticons are exactly as I remember them, and there is even an alternate reference sheet for those characters who, apparently, had reference changes during some of the episodes, namely Hauler/Grapple and some of the combiner members. The Dinobots even had both their comic references and the more simplified episodes' reference.
Heck, they even have an extremely detailed and ironically beautiful Unicron, his planet form, and some details of his insides, too. They have The Ark, the Autobot's control room, a detailed reference of the Decepticons' underwater base, and some parts of the insides of The Victory (the Decepticon Base). They have details of Cybertron, Iacon and Shockwave's base, the Ark before it crashed, after the crash, and scenery of the mountain they crashed in (they do a lot of crashing, don't they?).
My only complaint: the missing female transformers. No Elita-1, no Nightbird, no Chromia, no Firestar, no Moonracer only poor lonely token Arcee and the Japanese character Minerva (the second half of this book, Ark II, has all the Japanese characters from those series, as far as I know). Seriously, they put in Slugfest and Overkill (do you know these two off the top of your head; they're cassettes and they showed up for two seconds in the episode 'The Primatives'), and Twintwist and Topspin, yet they left out Optimus Prime's love interest? Fangirls should feel insulted.