Chuck's Reviews Transformers Earthspark Smash Changers Optimus Prime Bumblebee Megatron an
 

It's funny that at what is probably the end of the line for EarthSpark we get something close to traditional One-Step changers. Smash Changers work the same way as a spring-loaded One-Step changer but all the transformations are activated by pressing down firmly on the rear of the vehicle. Of the four I enjoyed Megatron and Thrash the most, but all of them would make for fun desk toys.

http://www.youtube.com/watch?v=leSZPNLZJe4