Technically, obviously it is interesting and it is an achievement. However, i don't get its purpose as a wrist watch.
If one loves mechanical systems, then one would get a mechanical watch.
If one loves accuracy and one lives in the covered zone, then one gets a 6-band Casio.
If one wants to read time more or less accuracy, then there are mobile phones and cheap Quartz that may be off 20s a day, but is that really a problem?
Good topic though, and good comments!
Best,
É.