Dchazen, take a look at my Gon reviews of the 350.5, XA-100's and XA-30.5's to get the details why I would select the 350.5 over the X-600's. I did not care for the X-series amps sonicly, but the X-.5 series are great sounding amps.
Srwooten, I'm glad that you love your Edge 10.1 in your system. I had an Edge NL-10 and enjoyed it very much, however when the new X-.5 series came out, it was much more musical then the NL-10 in my system. As stated above the X-series amps to me were somewhat cold and steely sounding to me, but when Nelson Pass came out with the X-.5 series and then the XA and XA.5 series he nailed it and I believe that he surpassed the Edge gear in its sonic performance.
Srwooten, I'm glad that you love your Edge 10.1 in your system. I had an Edge NL-10 and enjoyed it very much, however when the new X-.5 series came out, it was much more musical then the NL-10 in my system. As stated above the X-series amps to me were somewhat cold and steely sounding to me, but when Nelson Pass came out with the X-.5 series and then the XA and XA.5 series he nailed it and I believe that he surpassed the Edge gear in its sonic performance.