I did a video review of MP Rodimus, and my rodimus had all the usual problems (same as my Takara Version had).
The suspects being:
1) couldn't hold his guns
2) chest comes unclipped
3) backpack comes unclipped.
So during my video review I showed how to fix all the problems.
No problems holding any weapons now.. Even shaking him.
It's a long video but in my opinion worth watching since it addresses the most common complaints.
http://www.youtube.com/watch?v=khcZ5xprt0g