Well, what I would consider a limitaion, or maybe an oversight is that it can be damaged by plugging in devices that draw too much current and not just simply power the port off untill the over load is removed. Similar to a notebook (not all, but have seen this on a Toshiba notebook) that gives a device overcurrent message and disables the port. Once the device is removed and the notebook power cycled, the port is working again.What is the USB port limitation?
Now, this is easily overcome by remembering to only use externally powered devices that draw excessive current.