Well - the best advice I can offer for any NAS users -
Carefully review the release notes and see if it scratches an itch - the value is not in the firmware or the device, but the data contained within - some folks want the latest/greatest, but for most, wait for the first couple of point releases to sort out the major bugs in the new features added..
Make sure to have a sound/recent backup of the NAS before hitting the upgrade...