I actually purchased the BC Cho'Gath skin before seeing the Skin Spotlight (I am a HUGE nerd for both giant monsters and robots, so this was a no-brainer for me). I was shocked, then, to see how utterly underwhelming the Skin Spotlight was for him.
The Spotlight doesn't show most of his added content, like the crazy cool green sheen he gets when he uses his silence, his awesome blue pill effects, or his leveling/consume added v/o's. The Spotlight felt rushed, which seemed odd considering the very cool promotions done on the forums with the "found audio" and whatnot.
Anyway, the skin is just beyond awesome, and is worth every penny. I laughed over and over throughout my first game with the skin, and my opponents were even talking about how cool it is. I just find the Spotlight to be almost misleadingly short and incomplete. If anyone is interested in the skin, but kind of turned off by the Spotlight, I highly recommend searching YouTube for other videos (this almost feels blasphemous to type), because his quality is not shown off by the Spotlight.
In all honesty, this is something that really bugged me about the Galio Skin Spotlight when he got his legendary. I hope this doesn't become (continue being?) a trend!
TL;DR: WTB "Demonblade Tryndamere" promotional treatment for all Legendary skins, rather than the brief Spotlights we have now.