Side Burn used to be the most frustrating TF for me, though I did figure him out. He was about the most complicated transformation scheme I'd tried, and I have to admit that I broke out the instructions. Alt Grimlock is worse. Getting him to bot mode wasn't too bad, but figuring out how to get those shoulder joints back in place took me half an hour, with instructions! Who in the world designed this thing? I finally did it, but Grimlock has certainly displaced Side Burn as most complicated transformation... and that's just for the arms! The legs are simple. Is it just me?