Generally speaking I don't like spending money on speakers and other accessories that use proprietary connectors. Chargers and things like the keyboard are different because they have real utility and maintain the mobile nature of the device.
Speakers in the other hand... well you can get better speakers for less money most of the time, and if they use standard connectors or Bluetooth or something then you can use them with all of your devices as well as continue to use the speaker when you have upgraded or otherwise replaced the Prime.
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