I think the strength of the RNS-E (and the reason why I went this route) is OEM integration, not the features or usage. Support for DIS and SD cards, OEM phone integration and the Audi look and feel are features aftermarket systems don't offer. XM traffic, support for movie or MP3 DVDs, multiple optical drives (or flash ROM to store map data while listening to audio CDs) are missing features, some of those may come with a future software update.