Silent Sprockets, worth fitting?

[AJM]

Thanks for the replies chaps, i'd never come across them either but they popped up during an internet search. I agree a good set of well maintained standard C&S is quiet but i thought it would be worth a look.
Since i've owned my bike the chain has required regular fettling so i decided to change the lot to put my mind at ease, if i go with the cushioned sprockets i'll post some feedback, positive or negative.
Happy riding all  :thumbup