Hey, funny you guys should mention Cosmos, as that's the first thing I compared Vitamin to.
So far, I've preferred the sound of Cosmos over Vitamin every time. Cosmos seems richer and smoother to my ears, while Vitamin is a little harsh-sounding (not the first time a Waves plugin has sounded harsh to me).
Vitamin does give you flexible multiband control, and has multiband stereo widening, but as far as sound quality goes it hasn't impressed me yet. Will continue to try it out on various things for a while, though. I could be surprised.
Cheers,
Eddie
P.S. Cosmos is a cool TV show. :-)
Sonar X3 Producer / Win 10
The future exists in all directions.