Throttle, or Energon Sureshock if you will, was given away in August of 2004 at Toys R Us stores in Japan with the total purchase of 2,000 yen or more of Superlink toys. Reports are there were only 4,000 made. His combining partners, Accel and Screw can merge together to form the Windcharger.
While the combined form looks pretty good, this as a stand alone Micron sucks. Well at least the robot does. I can live with the 4 wheeler alt mode. These guys always escaped my grasp when I was collecting anything and everything Micron / Mini-Con related. I only was able to grab Throttle and even then I had to spend more than I wanted. I do have to say the use of the translucent blue plastic mixed in with the solid gray and black plastic looks good against the clear plastic. I would have loved to build Windcharger as I already had the other versions of this toy (Energon, Micron Booster), but it just wasn't in the cards for me.
I can only recommend this version of the Micron combiner to the hard core collectors, especially if you can't obtain all 3 at one time.