I bought this splitter after I needed another powersource for my new pedal. My Fuel Tank Junior only had five outputs of 120mA, 9V each. Like I said, I got myself a new pedal which was number six on the board. I figured that I could split the current of one of the outputs and share the current over two low current drawing pedals. Both pedals needed 40mA each, so splitting the 120mA would be a good solution.
I came across this splitter and it seemed to be the one I needed. You really need to carefully read the description of the splitter you are purchasing, because some are designed to split the voltage or even double the voltage. Make sure to choose the right one.
This cable is working fine in my setup. One of the splitters end has a white stripe to indicate that it is groundlifted (to make sure there is no buzz of hum when using it). My signal stayed perfectly quiet so I assume it's doing it's job. I experienced no cons so far.