I purchased the complete 24 hr mechanism, set for Sidereal time, in order to make a sidereal wall clock. Unfortunately there are limited options for a 24 clock face, so I ended up buying a 24 hr clock and replacing the mechanism and hands. The movement keeps perfect sidereal time! Great conversation starter about the difference between solar and sidereal time, and an easy way to know what will be overhead at night (no need for a planisphere, just a sky chart with right ascension).

Looks and works great. Very well made. Locked up very quickly. Could use some more detatiled user instructions to allow more efficient utilization by someone not familiar with GPS technology.

Not too much to say, it works great and was easy enough to assemble.
- Solder header
- Screw together
- Tape off top pogo holes
- Insert pogo pins
- Solder bottom pogo
- Remove tape
- Solder top pogo

Not connected yet to Raspberry Pi Zero W. No problems to solder except by mistake I mounted one display upside down.

I realize the designer has answered at least two people who said there was no documentation, and their is some. What is not mentioned in the docs is that the pictures show a different board than what is currently shipping. In the pictures, the pogo pins are soldered in the holes that have the pinout labeled. This seems logical, since you can then line the pins with the target, assuming they are labeled. And the current board shows pin one in the same place as the pictures at the edge of the board. However the current board clearly states "Pogo pin side" on the opposite side of the board, where there is no pinout! When I looked carefully, and read the documentation, nothing was mentioned about this anomaly. Since the silk screen is only on the "Top" of the board, and the pogo pins go out the bottom, it does not mean that the pins go out that side.
I guess it does not really matter, the pins will work either way, you just have to make sure you plug the cable in correctly, but I think I want the pogo pins to be labeled, not the connector, which means that you can look down the side of this board and see pin one on the target, as opposed to pin one being in the middle of this board.
I am still not sure what "Pogo pin side" is supposed to mean, but the pictures have not been updated, so it took me a while to work it out. I'm ignoring the"Pogo pin side" label.