Chuck's Reviews Transformers Studio Series Concept Art Rumble
 

While being very, very small, even the Core Class box had a lot of space left over, Rumble is an interesting figure. While I wish Rumble was released closer to Soundwave's original release date, Rumble can interact with the larger figure by fitting in its chest and the back weapons form a small blaster. Transformation is simple and I like how the back weapons are integrated into the alternate mode. I can only recommend the figure for those who are big fans of the Bumblebee movie, or Soundwave completionists.

http://www.youtube.com/watch?v=YCjCANpX0-Y