The NIST has a very nice history of radio controlled clocks which was written by Michael A. Lombardi. The National Institute of Standards and Technology runs the WWVB time service in Boulder, Colorado which broadcasts at 60khz, and allows my Skyscan Atomic clock to maintain accurate time (or would, if my office wasn’t essentially a Faraday cage). Some nifty bits of history.
I had a SkyScan too. My two basic complaints:
1. It hated re-syncing on demand, but always fixed itself at the scheduled time.
2. My kid kept bumping into the table and knocking it down, and the battery access door was too flimsy.