I keep hearing good things about this pedal. Does anyone who has it know how much gain it has? Also, how does it compare to the sound of a TS-808/TS-9? Would you say it is better than the BD-2 (Blues Driver) for blues/rock? Have at it.
It's not useful for higher gain.

They all have different sounds so you can't compare them.
I've got both the OD3 and BD2 on my pedalboard. The BD2 is for crunch, the OD3 is for a booster.

The OD3 is underrated, it's got its own sweet character to it when it's used as a boost, very nice pedal. Not so incredibly transparent though.
"Breathe, breathe in the air
Don't be afraid to care"

Fender Strat/Tokai LS80>few pedals>Orange Rocker 30