The blank keys definitely need some time to get used to. As a guy who occassionally writes programmatic, I rarely remember the location for special symbols - Especially with EU layout, where curly and square brackets are only accessible with Alt Gr key. I spent some time searching for the correct symbol while building my muscle memory. One Thing Which is difficult with blank keyboard is When You Need to type one-handed (while you're eating, or holding your drink, you know what I mean; D). Even harder with one hand operation: typing password with special characters.
Build quality is good and solid. You can send Actually someone to hospital if you hit him with this keyboard, Because this thing is heavy (about 1.2 kg). The KeyCaps have nice matt finish, and the upper body is glossy. It attracts a bit of fingerprints, and scratches will be visible. The Cable has this retention mechanism (sorry I could not find what the exact term for this), so it will not break Easily at the meeting point with the keyboard body. The cable is approximately 2 meters long.
The USB hub is a thoughtful feature. I always wanted something like this so I can plug my wireless mouse receiver without sacrificing the limited amount of usb plug on my laptop. One Less plug to deal with while moving between PC / laptop.
Overall I give this 5 stars for the awesomeness and l337 / h4x0r look, minus one for the price. Cherry G80-3000 LSMDE I think is more worthed (it costs helped!) - If you do not really care about how it looks.
Be warned, MX Blues are loud! I would not recommend it to Those Who has babies / children around, or obnoxious roommate / colleague. Maybe Key cap O-ring will help? I have to find out.