I've just released a review of Logitech's X620 6.1 Speakers.. How did they hold up? "I was surprised to find that at least at lower and middle volume ranges, the quality of these speakers is damned near that of the Z5300's -- that is to say it's excellent. Crisp and clear with no distortion to speak of, they do start to suffer a little more at higher volumes, but you can still crank them to a nearly uncomfortable volume before this happens. The subwoofer that comes with the X620's is decently sized and delivers very good bass. The midrange is good, but compared to the Z5300's is slightly lacking -- this is barely noticable."