Just got that Celebrate the Saga Sith set today and the Vader figure has become my instant favourite in the 3.75 scale. I think it's the same figure as the Force Link one?
The articulation may be basic but the sculpting isn't and the plastic robes and cape are the absolute best. I was expecting rigid plastic like the old POTF2 capes - which I would have been fine with - but better yet it's really flexible. You could actually sit this figure in his TIE fighter. I need more of this guy - and his cape in particular - to replace the softgoods abominations of the rest of my Vaders.
The Kylo Ren figure also looks really good if you're into that sort of thing.