JBL has created a fantastic set of traveling headphones with the Synchros S300. The sound is top quality. I had been mainly using high end earphones lately, but for extended periods of time, those can be uncomfortable. The S300 has good response across the bass, middle, and high ranges. The sound is very crisp and distinct across several music genres rock, pop, classical, jazz. Although an on-ear design, the cushioning does a good job of blocking external sound, so you have the sense of being in a concert hall.It does not matter how foot the headphones sound if they are uncomfortable. Whereas, I find most on-ear headphones press on my ears and don't fell very good, the S300 feels great! It has the right amount of cushion, and the top band is firm but not crushing. It is adjustable by sliding the top band out of the side pieces.The controller works well for adjusting volume, skipping songs, and taking calls.The S300 comes with a sturdy case, and the earpieces, swivel to the side to fold flat.The Synchros S300 is now my top choice of headphones to use at work and bring on trips.