Great little gadget, great little price!
A must for live keyboard players that want to run through the house PA system like myself, as most digital keyboards have unbalanced outputs. This little box by ART holds it ground (VERY sturdy construction, you could run this thing over with a semi) and does exactly what it's supposed to do, allowing you to run cables long distances without any noise/hum.
I have yet to mess with the ground loop/phase shift switches, because I haven't even had to use them yet. This direct box is completely easy, and could be described as "plug and play." Right from the box, I plugged my Korg Triton Studio into the front 1/4" inputs (I like to plug L (mono) into INPUT 1, and R into INPUT 2. You can then run the XLR outputs (OUTPUT 1 and OUTPUT 2, respectively) to the L & R mixer inputs.
Oh, and let's not forget... It's only $40!!!!!!!!
A big thanks to Patrick Dennis, my Sales Engineer for hooking me up with this little guy, it has invaluable since the day I got it. In fact, as I write this, I'm thinking about how I will be using it at an outdoor weekend gig tomorrow!