Any reviewer worth their salt will take more than a mere hour for a review. It's not "burn in" of hardware that's the issue, it's mental. A quick and hasty impression does not take into account the newness of the sound being heard. "New Toy Syndrome" can color the opinions of anyone. Also there are many different song types and material to be listened to, not to mention cross comparison with other headphones, sources, amps, etc.
I've had initial impressions I've posted before early in the "Fresh out of CES" thread, but it's not a full review.
Also, I will have a special section on the HE-560 used with my Smyth Realiser.
Since it's likely I will eventually have to buy the 560s blind like I did the 500s, thorough reviews are a huge asset. At the end of the day, as eager as we all are(I am as well) for impressions, hasty judgement will only confound the cumulative knowledge space and make it more difficult for people to sort through to gain confidence in buying the product. By taking his time, Edwood is going to be providing more benefit in the long run. Patience is valuable, and I can guess everyone reading this thread has a pair of headphones they enjoy, just relax and enjoy some music while we wait.