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And one more thing, the have great customer service. I accidentally ran over my headphones with my car, completely breaking the left earphone, and I was still able to send them in for a replacement. That's great customer service!
 
I absolutely love my s4is. They're comfortable, and provide deep bass extension and surprisingly detailed mid and treble for this price range. Whoever said they have artificial, overpowering bass like the V-Moda Vibes is out of his mind. It's not even close. These are tight-sounding headphones.

Just ordered a pair of Koss Portapros for when I don't want the ear-plug functionality, but the majority of the time, the Klipsch are my go-to.
 
Wow- thanks for all the feedback. Sounds like the vast majority of people that have the 4Si's are very happy with them. I'm no audiophile so I expect I'll be happy with them as well.

I've been using a set of Lenntek Sonix3's for a while now (they are much less expensive now vs. when I got them). Overall they sounds decent - certainly a big step above the apple earbuds - but they are missing the low end punch. Mids, highs and seperation all seems pretty good though.

My other issues is the lack of a volume control- its such a convenience not having to pull my phone out of my pocket to adjust the volume.
 
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