I have tried it side-by-side with:
- ZVex Mastotron
- Dunlop Jimi Hendrix Fuzz (the old two knob black box version)
- Visual Sound Angry Fuzz
- EH Big Muff (large box NYC version)
- EH Holy Stain (worst and noisiest pedal I have ever owned)
- Guyatone HM2 Harmonic Distortion (called distortion, but to my ears sounds very similar to a muff)
I did a blind test between the Mastotron and the Cool Cat with the co-guitarist in my band switching between the two pedals and adjusting the dials while I played. The Mastotron won in most cases (especially for single note leads). But for $30 the Cool Cat Fuzz just kills!