Brilliant piece of kit worth every penny. Takes a bit of programming of course, but they supply a great interface for that. Also you have to learn the shortcuts. I spent a bit of time planning on paper which shortcuts to program, and committing them to memory - now I don't even have to think about it, my left hand hits the shortcut whilst my right hand controls the mouse - very fast indeed.
Its well built too, feels quality under the hand, and the jog wheel is very accurate. Highly recommended for pro editors who work on FCP like myself, a great investment.