Silent Sprockets, worth fitting?

[Fazerider]

I've only fitted the front with an OE sprocket once, I guess it was a bit quieter… but, then again, a new C&S is always quieter than a loose old set anyway.
I have even less idea of how much difference a "silent" rear sprocket might make to noise levels, but it looks as if it might interfere with the delivery of oil by the scottoiler so that puts me off.