So, we've got a hate thread going on, why not do the reverse? What figures you just LOVE to switch around? Universe Hound springs to mind, he's a good all-rounder. Then there's ROTF Legends Devastator. I love just picking him up, separating him, transforming the bits into each mode, then re-assembling the guy. WFC Soundwave is also a delight, even if I'm not INSANELY crazy about the alt-mode. And I also LOVE to transform Generations Wheeljack/RTS Tracks. Once I figured out how to put the gun in the trunk to keep everything tidy, everything clicked for me.