I've been using the HD700 with a TRRS terminated Blue Dragon cable on my Sony ZX2 for a few weeks now. I am absolutely, completely and thoroughly impressed. While I don't think the HD700 were worth the $1,000 USD asking price four years ago, now that they can be had for ~$450, I see them as an excellent value (relatively speaking, of course).
Again, my frame of reference for comparison is the IE800. While I would say the IE800 has a punchier low-end response and slightly crisper, sharper detail retreival, the expansive sound stage on the HD700 provides just that little extra something that the IE800s could never hope to produce.
I can begin to understand why some people poo-pooed the HD700 initially, though. As I said, I'm using these on a ZX2. As such, they sound fantastic. But using them on my desktop PC (through a Klipsch Promedia 2.1), the mids seem kinda...distant and hollowed out. I have to use a pretty aggressive EQ to compensate. So yeah—I don't doubt that they are finicky in regards to their sources.