We used them for our underwater robots for the NURC this past summer. We used Banebots speed controllers that have a BEC (battery eliminator circuit), which provides the 5v necessary to operate the splitter. We removed the battery connector, shortened the LED leads, and removed the power switch from the signal splitters, as well as taking them out of the plastic housing, to save space in the crowded robot hulls. We used them tethered to the transmitter, without a receiver.
There are a couple pictures of the insides of the signal splitter here
http://photos.project1726.org/thumbn...lbum=30&page=2