The idea that pouring time into customizing your keyboard just so will boost productivity is madness. Is typing speed really the bottleneck for anyone?
It's not (just?) the typing speed though - for many it's the ability to limit hand and arm movement, and alleviate the effects of many types of RSI. I just ordered one, and as I type this through noticeable pain in my right wrist, I eagerly anticipate this keyboard helping me continue a healthy career.