I have the S2 headphones I picked up a year or so ago, and loved them. They are so nice to wear, its like they are not there. Well went to order a backup S2 headphones. Well can't get them anymore, so dropped the money and got the X10i. WOW what a difference to anything I have ever heard. I didn't know music was suppose to sound like that.. Highs, Lows, and can understand the words to the songs all at the same time.. The X10i makes me not want to hear any sound if its not coming from them. Unreal!!! Thank You Klipsch!!