Do you really think that Sony has made some hard changes to limit the output power to 2mw? Don't think so, I'm sure that there is some eeprom tweak to change it to 5mw.
BTW, as soon as I realized that the output power was ridiculous (and checked it at the user's manual) I made a refund.
No distorsions, but not enough volume to hear the music at the noisy streets of Madrid.