Just received my DX100 tonight and compared it immediately to the Studio V. Needless to say, my Studio V will be up for sale soon. The much more cohesive presentation, finer detail and bigger soundstage stands out the most to me.
One thing, though, is that while the DX100 correctly displays track information it won't actually play some FLAC files that the Studio V plays just fine. Is this a known problem, or do I need to convert the FLAC files to another format? The FLAC tracks are displayed as 16-bit, 44.1 kHz with a bitrate of 765kbps. All of my 320k mp3s play fine on the DX100.