I'm not a fan of the look of the HD 700, but still happening. After many years with a HD 600, I wanted to rediscover my pieces preferes with more straightforward attacks and better spatial restitution, for example Beethoven symphonies. The HD 700 is a great tool, but I find it too linear and close to the HD600. In the end I only care that one day, to keep a one month HD 800 ... gladly abandon for the fantastic Oppo PM-1. Like what it is difficult to satisfy her ear.
Conclusion: the HD 600 remains, especially at a price, an excellent choice audiophile today. Now there is the HD 650, which is almost identical and thanks to a choice of the best components limits the variations of a copy to the other. I'd settle for one of these two models rather than the HD 700, but everyone to make their own judgments :-)