Back on Cybertron, Thundercracker was a master of using sound to his advantage. His fear-inducing sonic booms were tuned perfectly to the composition of the atmosphere. Sonic vibrations from his attacks could be felt thousands of miles away, generating panic in those nearby, and deep unease even on the other side of the planet.
Not much. He might just be the best-painted of the Western Seekers, but apart from that he's just another version of the same mold. I bought him to get my original Seeker trio together, that's all. So recommended to Seeker fans and completists, but all others who already got one or more versions of this mold might just as well skip it.