Is the new EDP more than just a software update?

["eric potter" <babycat@hotmail.com>]

I'm trolling for an EDP. One option is a used one with full memory and 
foot controller for $500. Figure in $45 for new software, not a bad 
deal, right?

But I'm wondering if there is more to the latest EDP bought new than 
just the software update (which, don't get me wrong, is a fantastic 
improvement) Were there changes to the hardware or controls, etc.
Am I missing out by not buying the new box?

thanks all,
-eric

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