I think there's nothing wrong with a refurbished set because
internal working parts are still fine, no point wasting it. But
something's wrong if they use back the old flash memory. So better
ask if the flash memory is new or carried over from an old set.
This is because flash memory becomes less and less efficient
with more read/write and delete cycles. So if it's an old flash
memory chip, it's no longer that efficient anymore.
