One of the best features of this clock (I have one and have been messing with it a while now) is the up to 100 kHz refresh rate and an analog LCD driver circuit that makes the digits not flicker even a bit, even when dimmed, with a high speed camera.
That and the fact it's the highest precision clock display I've ever owned!
It is certainly not inexpensive, but it's more of an art piece than a practical instrument, unless your eyes can see in the thousands-of-hertz range!