I am the second owner of this Awesome Tube Distortion pedal. There's nothing like the sound of a Tube overdriving. You can use this in front of a solid state amp to give it some tube warmth and response or you can use it with a tube amp to essentially add another tube to the preamp (extra gain stage). The only thing i have done to this pedal is replaced the footswitch. there is one screw missing from the power jack, but it doesn't affect functionality. It does come with the original power supply, but can also be powered by any 9v pedal power supply.