I ordered a pair of unpotted mules last week and had them installed two days ago, and wow, awesome pickup! Clear and creamy, but also full of bite and power, a lot more than i expected. Anyone having doubts whether or not mules can do metal rest assured that they have plenty power to do all kinds of metal, I've even tried some grind and djent (really). The thing is that they are so clear that you can stack a lot more boosters and distortionpedals than usual and still retain a definition without getting mushy. Up to and including metallica tones are a piece of cake with them if you have a good amp and/or distortion pedal, with an additional booster they can easily go grind, djent or swedish death metal on your ass! They do easily feedback, but if you're quick with the volume pot that should be no problem.