Ratchet's transformation is surprisingly involved in the beginning, but mellows out towards the end. Starting out you have to do things such as "breaking" the side doors and panels and rotating the midsection of the hood 180 degrees to reveal the head. Afterwards, though, is very straight forward and simple to figure out. This is the type of transformation design I love. It's innovative and interesting while not being too frustrating or annoying. In the end you'll have yourself a pretty spot-on looking Ratchet.
The verdict on Ratchet comes down to one thing; are you a scale whore or are you not a scale whore? Ratchet is considered one of the best movie deluxes to date for numerous reasons, but his height can be a total turn-off if you'd rather keep your movie cast at roughly the same scale. As someone who tries to keep scale prominent in his movie collection, the quality of this toy made me turn my head at it just this once. If size is not an issue then you have no excuse not to pick this marvelous medic up.
Ok, so that's been 3 Autobots in a row. To be honest, I'm getting sick of this goody-goody crap. Time to pull a 180 and focus on some of the bad bots of DotM....