I had 1 for a while, what do you wanna know about it? :)
well, if it's worth the buy... is it a good booster?
It all depends what you wanna use it for really.
At different times I used it both to push a breaking up amp into further drive, and at the end of a chain of effects to boost the overall volume for solos etc. It worked well in both of these uses.
The main reason I sold it on was because I had other Fulltone and ZVex boost pedals I was using more than the Duncan 1, otherwise I probably would've kept it.
Also, they sell the pedal as having a 3 way resonance switch on it where it (apparently) changes the sound of a single coil pickup into either a vintage humbucker or a high output humbucker. This is BS (to my ears atleast) and isn't a valid reason to own the pedal, but for a booster, you could do alot worse for the money.