Picked up a used Sweetback Driver from Main Drag Music in Brooklyn today.

I know it's premature to say that this is the best boost pedal I have ever played/heard, especially since I have several world-class boost pedals already and have not direct-compared them to the Sweetback ... but, I'm going to say it:
This is THE BEST boost pedal I've played/heard!!!. I don't plan on using this pedal as a boost, per se, but more as a keep-it-on-to-sweeten-the-tone device.
Without losing transparency, it adds just a touch of width, depth, and sweetness to your tone. When turned off, your tone seems to shrink and thin out. It doesn't
thicken your tone like a SHO, however. To my ears, it's more like what the Fulltone Fat Boost is
supposed to sound like.