Not too much. Better display, another set of RCA outputs, high voltage RCA output and better equaliser functions. I can control the sub woofer levels directly from mine too, although I think the one you own might be able to do that.
They are both really good head units. I just wanted the additional connectivity and equaliser functions. I know mine can read up to 200GB USB data storage devices, although I hit the folder and file limit before I hit the storage limit. Still more then enough music for me though. The reason I have that much is that I use the portable hard drive for Uni too. Fits perfectly in the centre console bit by the gear-stick, no bigger then my wallet.
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