>>11523465Megatron's alt mode is far simpler by comparison - most of the actual transformation is in his arms. Unfortunately, you can't move his cannon up or down due to how the transformation works; also, his main cannon isn't blast-effect compatible (though both of the anti-infantry machine guns that flip out from his wrists, mentioned above, are!). I will say it's pretty satisfying to roll him around on those chunky, spikey wheels of his, though.
Here's a group shot of all four characters released so far. Megatron is easily my favorite of the group.