I concur witht he impressive engineering feat that is RotF Leader Optimus Prime. When I finally got the bot in my hands I just couldn't fathom how that thin lanky bot would convert into a truck.

The robot mode is relatively kibble free except for the biggest downfall of the figure... the damn shoulder kibble and forearm kibble plus the blades completely bash against each other overlapping and just cannot sit right. It affects arm movement and I was severely dissapointed with that. The legs were great with hip joints, knee joints and a ball jointed feet. The mech alive gimmick is not all that good and the effect makes it look like OP is about to combust.

However the real winner here is the conversion. Like jay said. Initial transformation took me a good 30 minutes as Hasbro's instructions were of no help and there was even a few errors. Just be careful at:
- step 4 (requires precise alignment and pegging them properly in the right spots)
- step 7 (the chest piece that looks attached inside his chest grille is meant to be popped out of it's groove)
- step 10 (requires a fold down of the shoulder pin joint while swivelling the shoulder joint back wards)
- step 16 (the diagram is actually helpful here, just pay attention as you need to wedge it into the wedges in the arms)
- step 18 (requires the canisters to be up and not in the spot shown in the diagram, as you will never get the panels to fold over the canisters).

Of note in the conversion is the amazing way the full smokestack converts together and how the chest turns into the actual truck cab and still retain the mech alive gears gimmick.

The truck mode is beautiful with nary any seams or any obvious visible bot kibble on the underside. Absolutely seamless and you feel rewarded for such a puzzling conversion at just how it all fits together. If I was to point out something - the gap near the utility box and gas tanks are a little annoying but nothing major. You may wonder where the button for the truck mode sound effects is, it's just on the back of the cab on the grey panel, the small square on the left with the little triangle. Thanks to jay for pointing that out to me as there was nothing hinting it in the instructions and only a vague useless pointer in the back of box.

Quite simply an engineering marvel. This is why I love Transformers.