[H3N51N]

Plain & simple. We've seen dozens of these transforming devices over the decades, which ones standout to you the most & why?

Currently I gotta say the Overdrive Tracker. I dig it's simple design, multifunctionality & sounds. Being able to run its wheel across any surface & initiate a morph also made for plenty of fun & creative scenes. Plus it always looked epic when spun around in hand before Mack used it. If only the forum's filetype limit was higher, then I'd have some awesome GIFs to prove my point.