Jürgen Grau is the deigned behind this device and he sells this clock as both a kit and fully assembled. The kit costs €149 and the fully assembled costs €179 (Currently: $190/$230) Jürgen is very accessible and is fluent in German and English.
Now, on to the clock! Stylistically, I like it. The photos on NixieKits.eu do not do this device justice. The LED’s are much more vibrant than I expected and the colorful effect that they create manages to look nice without looking gaudy. There is a knob in the back which allows you to turn the brightness of the LED’s up and down (and completely off.) The colors slowly cross fade and and produce a pleasing effect on the front of the case. I didn’t think I use this feature much because I generally prefer simple designs – but the colors are mesmerizing. I actually leave the LED’s on all of the time, something I would not have expected.