I use these to run from the outputs of my audio interface into my various 'grot boxes' to check mixes on, and the quality is absolutely fine for this purpose, albeit a bit of slight noise as they are only unbalanced cables, but for this price you can't go wrong. And for the job I have them doing, a little bit of noise doesn't adversely affect the sound.
The build quality is ok, with the moulded connectors seeming to be slightly off on my model, with the actual 1/4 inch jack not quite running parallel to the moulded housing. This, however, is acceptable at this price range, and does not affect the quality of the connection between the jack and the input. The colour coding rings are very handy.