The only review so far is that DIY link posted earlier. I am sure there will be several professional reviews in the upcoming weeks. I would expect the reviews to be uniformly positive given the reputation of the HD650. It's not like a revolutionary headphone coming out or a new product from an upstart company. The HD650 is a legend. Sennheiser is not going to be mess with the tried and true formula too much, and it's reasonable to assume that they will only improve on the 650.