Hello everyone!
I just got my first pair of these headphones and I'm listening to them while writing this.
First I have to say that damn the bass is good! I'm not usually one for the real heavy bass but it sounds good now. I'll have to experiment with the different tips, but seems like the medium size gives me the best seal. With them I don't feel like they're about to fall out of my ears. It was a bit tricky to put them in properly, but I think I figured it out. This feature was one of the reasons I chose the Klipsch. I travel about 2 hours every day and I need isolation from the outside noise, while being able to hear my music without sound leaking out and to control the phone (got them for the iPhone 3GS).
I made a playlist with songs from every genre that I like, with songs I know. I've listened to them with the stock iPhone headphones and a Sennheiser HD 202 at home, so I can only compare the S4is to them. The bass dominates, but not so much that it's annoying. But it's not only the bass, I hear stuff that with other headphones just didn't come to the foreground. I'm gonna connect them to my laptop and let them burn-in at night for a few days, I'm hoping the overall sound will clear up a little bit.
Otherwise, the first impression is good. I can't think of any other earphones that offer this sound, isolation and functionlity with my phone for this price.
A question about the burn-in process, for the experts: should it be just pink/white noise, or heavy drums and other stuff too? Does it even matter if it's my own music or some generated noise?