Apart from the loosey-goosey leg joints, the real problem I had with the Alt. Prime mold is the shoulders. No, I don't mind the shoulder towers at all, it's just how junky they look. The bumper pieces just flip down at arbitrary angles, leaving all sorts of unsightly gaps and simply just not looking all too good. Luckily, that's easily fixed. First, unscrew the little black tabs that hold the bumper halves onto his shoulders. You'll find that they're mounted on a peg shaped like this: It should be pretty obvious what needs to be modded, but in case I have to spell it out for you, just carve off the tab that I circled in yellow. Once you're confident that none of that tab remains, just screw it back together. Simple as that. What this mod allows you to do now is swivel those black tabs around, giving you the ability to close up those shoulder towers much more attractively. Goes from this: To this: The new mobility of those black tabs doesn't hamper transformation at all. You'd think there'd be alignment issues, but there's actually a molded stopper in there that you can swing the black tabs against, lining them up perfectly for vehicle mode. It's like this part of the transformation was intended all along, but then modifications were made for stability reasons, or something. Doesn't seem to be causing any problems for me *shrug*.