I never owned Sy-Klone as a kid, and as such, I don’t have any real attachment to the character. I was also always a bit confused by him–did the “klone” part of his name mean he was some sort of weird clone of He-Man? His face did–and does–look a lot like He-Man. I realize Mattel needed to make the figure’s name trademarkable somehow, but by introducing the “clone” question, it confused some of us kids.
X-Entertainment wrote an exhaustive analysis of Sy-Klone that I highly recommend. I was also quite fond of the Millennium version, which introduced a sort of cyberpunk street samurai look to the character. The new Classics version is of course based on the vintage Sy-Klone, with the small addition of the Millennium-style hula hoop.