The Coppers are so far superior to the S4i I once owned that there really is no contest. There is no mood I can be in where I'd prefer the Klipsch. (I'm assuming the S4 and S4i aren't that far off each other)
Right now I am very satisfied with my two IEMs. My W2s are comfortable, clear, and I can wear 'em all day.
My Coppers are what I go to for bass and ease of pulling out frequently when people approach my desk. They have clarity and precision, but a more colored sound signature. Which ones I prefer are entirely mood-based.















