I have used these strings exclusively for several years. I like the sound, actually. But of course, the main reason is that they last so much longer than non-coated strings before they turn dull (app 3-4 times longer in my case).
Moreover, I like the smoothness of the wound strings, sliding up and down is effortless and makes less noise.
In my opinion, they tend to feel slightly lighter than most strings of the same gauge. (This is neither a pro nor a con.)