I have one (sans modules, obviously, for now), and I use it daily with great satisfaction. Not sure yet if it improves my RSI symptoms, but it's not making them worse. It does take a bit of time to develop muscle memory for the different layers. I'm eagerly awaiting the modules to be ready (got the trackball, track point, and the key cluster on order). one other point, I did not find the palm rest to be very comfortable, and wish I could attach it at an angle to the keyboard itself. currently it's sitting in a box since I carry the uhk with me, and it's somewhat hefty.

I have one. It’s sweet even without the modules, can always order them later. I consider it one of those few perfect purchases. Only issue in 1/2 year: I thought the cool coiled cable was too short so i bought a straight replacement cable for 5€.

very cool, and also the most 90s looking piece of electronics i've seen in a while