I love the way the CW exhaust looks and have only heard the youtube stuff on it.
The Ixill looks sooo freakin ugly but sounds incredible!
They are about the same price so that is not a factor. I was thinking about both as well but might try and fab my old slip on from my 06 600RR since that and the D675 have similar exhaust (I mean they both have undertail, if it works right i dont know).