I rate it as four out of five stars only because I would have liked more information on the on the professional croc hunters in the 1950s. I didnt notice any drop in sound quality. Also, just to be sure, i may slip a nail into the small strap that comes with it and tack it to the wall. Each comes with its own way of tapping/holding the earpieces for different manipulations, they simply take time to get used to. The low end is boosted even without the Bass Up feature but it doesn?t severely hinder the other frequencies. Wont fall off the pad. The keychains are in perfect condition and look amazing! The left is perfect but the right one is a little snug on the top of my foot where the band crosses over the boot. had to plug charger to be able to reset. I CALLED SONY AND THEY TOLD ME IT IS 7.