Overall Ive had a good experience minus two things:- not all headphones will fit through it. But then, in a fit of "upgrade" fever I started buying audiophile headphones, hoping I would enjoy at least one of them as much as I had the 580 when our love was new. Finally gave out where one side of the headphones will work or vice versa. "Is Timmy in a ditch?" "Is the barn on fire?" "Do you need to go out?" You just dont know what your dog means and I dont know what these beeps mean and its driving me "beeping" crazy. Getting the 8. Calidad de sonido estándar, no se aprecian mucho los bajos The case doesn?t slip or slide and I?ve used the case while at work and even during a drop it didn?t fall off. Active NC will use electronics to block out all sound using a mirror/negative sound wave to cancel out the surrounding room sounds. Review by Linda Clifton: I was disappointed after receiving my slippers after all the great reviews. The ear buds work perfect, and the cleaning kit is extremely useful!