First off, finally got my Bruticus upgrade set, and I have to say, after putting it together, I am in awe. This thing is so kickass, I can't begin to say how much. I put it together with my Energon set, and I'm so tempted to not even bother seeing how it looks with my RotF set. Anyways, enough fawning. I remember the set being delayed due to mold differences between the energon and RotF/Classics versions. Did they ever end up saying what the part that was different was?