Of course there have been some sigificant changes - but Apple has set a benchmark for accessory longevity by maintaining roughly compatible design from generation to generation. Most changes have been necessitated by *improvement*, as well. There was some net gain in giving up backward compatability with previous accessories in most cases. I don't see this among Android phone devices - and it is something that I keep waiting for one of the Android manufacturers to catch on to... iPod is a BRAND... none of the Android phones has become a BRAND, Android hasn't become a brand, really... When I go into a Target and there is a thriving Android 3rd party accessory aisle - then we're on the right track with Android devices. Just my opinion.