Well, it is just a power supply, an optional accessory for Dunlop guitar pedals. On the face of it, it just does its job nicely. However, there are two points on the plus side that I'd like to highlight. Unlike some other power supplies that I had some experience with, this particular one is pretty quiet (does not produce lots of that mosquito-like tone when plugged in) and does not tend to heat up while in operation.