This is one of the movies that took 38 hours to make one frame since almost every movement involved like 5-7 other moving parts. They also have such a great look and I can't believe that people could figure out how to make the transformations so fluid! The soundtrack is also great (I like Autobots and Arrival to Earth, both available on amazon).
My favorite is Ironhide! I like his accent, his look, and his big guns....