So recently I decided to add one of these dimmers to my kitchen lighting, which is on a standard 3-way (double switch) circuit.  The folks at home depot, as well as all of the available documentation (including the box it comes in) suggests that 3-way operation works fine.

What they fail to mention is the 3 way only works correctly with the dimmer if you purchase the companion dimmer switch, which of course is not actually sold individually.

UGH!!!