User have expressed that the sound quality is very good with these cables, better than the std name brand mini headphone extension cables. As mentioned by others, the more than stereo earbuds don't work with these cables, but for in ear monitor systems no one should use that low of quality ear buds anyways.
Hello, thank you for your response. If the item is failing on you, we would be happy to set up a warranty replacement. Please contact us at firstname.lastname@example.org with your order # and we can look into what options are available to you.