I needed this because my headphone cable hits something and might break so I needed a right-angle connector so that I can turn it away from what the cable is hitting. This product does just that. Everything seems nicely built. There's a minor issue of scratchy sound when you move the connector (might only be in my case) but overall I have no complaints.
I use it on the first/last pedal of my pedalboard to plug in a straight cable. So far, I can confirm I have not noticed any change in the overall sound as a result of its use. It has made my life a bit easier