Under Pros, you have:"USB 2.0: Compatible with current accesories and peripherals."
I think that should read "Compatible with *some* accessories and peripherals."
Many USB devices require software drivers. These are currently built for running on Wintel hardware - NOT for ARM hardware.
This will also be a problem for Bluetooth devices. For example, since the Surface RT has no GPS capability, I'd want to use my Bluetooth GPS logger with it. But I can't since the software driver is for Wintel hardware only...