I've owned this pedal for 25 years, never let me down.
Built like a tank.
One of Roland's earliest forays into guitar effects, pre-Boss.
I've performed three modifications to lift this poorly designed circuit into legendary status. This pedal will never leave my board.
1) Changed the effect order to be Wah before Fuzz. The rookie engineers at Roland designed it with Fuzz before Wah, the idiots.
2) Removed the 20dB attenuator in front of the Wah circuit which causes a massive volume drop when engaging the Wah - WTF was Roland thinking?
3) Added a 12dB attenuator in front of the Fuzz circuit because the stock Fuzz gain is way too high, even on the lowest setting it was like a Muff on full gain. Now it has useful rhythm crunch gain on 0 and full-blown outrageous fuzz on 10.
I boost the Fuzz into stratospheric levels occasionally with a Blackstar HT-Boost.
I demonstrate my take on David Gilmour's "Time" solo near the end of the video, to show how close the pedal can sound to a silicon Fuzz Face on the "Sine" tone setting. On the "Square" setting it's more like a Muff.
Timestamps for the various settings are in the description on YouTube.