Ok folks, I normally don't write reviews but figured I'd help someone out who was in my shoes.  I'm a cross fit / weightlifter who listens to all music, but primarily hip-hop / R&B; during workouts, running, cycling, etc. I was in a debacle trying to determine whether to get these S4s or the Bose IE2 (StayHear tips).  I've heard reviews claiming that each one is better, so I initially bought the Klipsch, then decided to try the Bose.  Here's what I found:PROS:- Overall the sound is great, the highs are good, mids are decent, bass is just OK --- not impressive (which is why I give it 4 stars and not 5), I'd say the sound is better than the IE2s.- Noise-cancelling - when I put these in, I don't want to hear any other sounds (e.g., the gym, other people, noise, etc), I want to be submersed in my own world.  For this reason, these are way better than the Bose IE2's, which ARE NOT NOISE CANCELLING.  When I tried the IE2's, I couldn't concentrate on my workout as I still heard normal noises, chatting, weights dropping, the A/C, etc.  For this reason alone, I am selling my 5 day old IE2's for a loss.CONS:- Bass is not impressive, it's just decent.  My old Sony's had better bass.- Although it comes with 3 sizes, the silicone is just a bit awkward and doesn't fit in my ear securely, so i sometime have to adjust it while running or doing other activities. In this regard, the Bose StayHear tips would must betterHope this helps. 

Question: How is it the bass?
Answer: bass is just OK