Decent quality, but the plugs are needlessly HUGE and increase the clearance you need behind whatever device you plug them into by about 3 inches when you figure in the bend of the thick wire. And don't get me started on the GIANT hunk of needless plastic at the point where the 3 wires join.
I would only recommend this product if you have large amounts of extra space in your install. Otherwise you will be annoyed at just how bulky this device is for such a simple task.
Heavy duty! Using it to split the output from my preamp out to 2 subwoofers. Initially had trouble getting it on the crowded preamp female output. Loosened the plastic sleeve to allow more play and tightened it after making the connection.