Link. Mostly a standard review. They tested themselves to see if and how much their typing rate would improve, and they got roughtly a 10% increase over a week or so.
Couple mistakes from their article:

• IBM Model M keyboards and Das Keyboard II have very different switches. The former has buckling springs with a membrane switch, whereas the latter has Cherry MX switches.
• Different key weights are not unique to this Keyboard. Keytronic makes many keyboards with this property using their own rubber dome switches. Also Toupure’s Realforce series employs a similar design using a capacitative switch mechanism.

Very few of these English reviews actually look very deeply into how the keyboard is built. They just repeat the marketing message. It’s like talking about cars without talking about their engines.
By the way, their registration for the forums totally sucks. Why should I have to give you my mailing address? I guess this is why people have blogs.