Bests & Worsts Reviews from Amazon

My last wireless cans, Sennheiser, were great electronically but very bad ergonomically - any small movement of the head and they would fall off - no 'spring action' at all. These new Sony cans fit great with proper 'spring action' to keep them from falling off your head. Electronically, I have not had the static problems reported by other users, these play clearly with no noise. I have only 2 concerns: 1) they don't go as loud as the Sennheisers - with the TV speakers turned off I have to turn the TV volume up to 100 - with the others I turned up to only 80. On any low-volume program these may not reach a satisfying volume level, and 2) apparently there are no user-replaceable batteries. The manual does not address this in any way. My concern is: when the batteries go bad what do you do? Seems you have to throw away the cans and buy new ones.