Is used in a recording studio environment, as a support for other box (with other 12 channels on there). Requirements for audio are quite demanding in this situation, and they really don´t degrade your signal. That are the best point. In the other hand, they are extremely sensitive to the high temperature of solder. The plastic welds too easily. The person ho has been making the box is a guitar pedal manufacturer, so is not new in soldering and knows a little about that. We both arrived at the same conclusion. Have lots of patience, buy good tin and soldering kit, and good look!