Very usable, but not perfect.

Pros:
• Clock stays in place when switching between laptop monitor and external monitor.
• Clock doesn’t take a space in the command-tab app-switcher, nor in the dock.

Cons:
• No option to set its translucency. Clock does have the option to disappear upon mouseover, but I wish I could see through it always at a glance.
• Too many skeuomorphic decorations. I just want a white circle with thin, black hands, and minuscule black tick marks. No border, no other unnecessary graphics.
• I wish I could make it smaller than 100x100 pixels (how about 50x50?).

starts with j about deepClock