This is for the platinum edition that came with a trailer and shiny red Sideswipe. I felt the torso was a bit plain - too much shiny - so finally bit the bullet and added some blue! Specifically to completing the shoulder guards and painting the thigh pads, shoulders, stomach pieces and collar piece. I think it nicely breaks up the bling.
Alt mode is unchanged.
Also, despite what I've read the backpack can't be removed without compromising the robot mode. As best as I can make out this is different from the First Edition mold; specifically, the smokestacks are molded on to the robot body and not the vehicle shell.

Before and after. Before pic taken from a stock pic I found on Google.