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.