Chuck's Reviews Transformers Earthspark Spin Changer Optimus Prime and Bumblebee
 

Don't kid yourself, the Spin Changers are gimmick first and only. Of the two Optimus has the most articulation since its arms bend due to the transformation, but the gimmick works slightly better with Bumblebee. The figurines are nice but feel out of place with Prime and Bee. These are definitely best enjoyed by a younger audience.

http://www.youtube.com/watch?v=fO1e4HfcHiE