Pros:1) Massive amounts of distortion - it will scream endlessly until you mute the strings. The tone is extremely heavy, saturated and delicious!2) Mid frequency selection allows you to access a large range of sounds. This pedal acts as a distortion plus EQ. I don't think any pedal in this price range allows so much tweaking. It's almost like having multiple types of distortion in the same pedal. 3) Unbelievably low price. I would buy it even if it cost twice as much.4) Solid build quality. I have been using it for over 2 years, and it's in perfect condition.Cons:1) It is noisy..but that is unavoidable, given the enormous amount of gain. I repeat - this pedal has LOTS of gain!! You need to a good isolated, filtered power supply to run this pedal with acceptable output signal to noise ratio. Wont work well with cheap SMPS based adapters.Other things to consider:-This pedal is NOT meant for rock/blues/jazz etc. As the name suggests, it is tailored for heavy metal sounds. Even if you turn the Dist. and Level knobs to nearly zero, you still get a saturated, fat tone. In fact, it sounds rather unappealing at extremely low settings.-If you drive this pedal via an overdrive or boost pedal, it sounds unbelievable..endless feedback without touching the strings, and earth shattering distortion! Perfect for droning.-This pedal does not have true bypass. That is not an advantage or disadvantage. Look it up and decide if buffered bypass suits your setup.To sum it up, Buy this pedal without thinking twice if you want a metal tone!