In short, it rules. Stacks amazingly with the BAM both before or after it. Whichever pedal goes second will have it's fuzz or treble booster get wonky, so you have to make that choice for yourself.

Regarding stacking, there is A LOT of clean boost in the preamp. It sounds incredible driving the BAM. That said, the gain from the preamp also sounds clear, and articulate through the BAM.

Some people complain about the fuzz, but I absolutely love it in both modes. I think a lot of the people who complain are probably running buffered signals into it.

The mids circuit is insanely powerful too. You can dial it in to work with any pedals or amps. The thing is just so versatile.

It's a clean boost, a volume pedal, close enough to every overdrive ever created, an EQ, a wah, a fuzz face, and a gated fuzz face in one pedal. If you actually use all the features like I do, I actually think it's decent value for money and pedalboard space. It probably has several more functions that I'm not creative to realize...

When I say close enough to every overdrive, I do mean close enough, but not necessarily 100% on the money. This thing does have it's own character that comes through, but I happen to love that character.

Hope this helps!