A promising app with one major problem and a few minor annoyances. The big problem is that it behaves erratically with Spaces. At first the clocks appeared in every space as expected, but after a while I was down to only one clock appearing in one space. No amount of fiddling could fix it, including going into System Prefs > Spaces and adding Desktop Clock as an app that appears in "every space."
Minor annoyances include the app not remembering clock positions on relaunch, no second hand on any of the clocks, and a menubar icon that is too big and too bright.