I have been in some shops recently and played a few of the new Martin guitars including the D-15, while I have found a couple of them that did sound quite nice there just is no reason to consider them that much high of quality to demand such high prices. Of special note is the white corian nut- or as better stated thermosetting plastic,why is it so hard for a company to just build a quality item and put a tusq or bone nut, saddle and pins in it to get the most out of a instrument.
I have seen a improvement in the Taylors above the $800 range and found most of them to be very pleasant to play.
Just a few thoughts of my own.