I bought this Controller to interact with Cubase LE and Acid Music Pro
Its well built, with very smooth knobs and buttons, 8 of which are touch sensitive. It also has a series of buttons to interact with the DAW such as stop, play, rewind etc, and you can browse Komplete Instruments with a control knob then select straight from the keyboard.
So why only 3 stars?, Because I feel they released this device too early, the supplied software "Komplete Kontrol" does not fully support it, and the "Controller editor" software does not work with this keyboard. And also, I cant find any option to control the key velocity, as it stands you have to pound on the keys to get a reasonable level of sound.
There is currently no method of reassigning buttons or the keys on this device at all. Native Instruments state it will be supported by Komplete Kontrol "as some time in the future"
In hindsight, I should have waited until "some time in the future" before purchasing this device.
My advice, buy the S series if you can afford it, otherwise wait a while.