Ive had a pickup booster for about 3 or 4 years now. They do a fine job of boosting signals. As a matter of fact, one of my most memorable memories of really really good tone came from running an am dlx power telecaster through the pickup booster and into a 1970s 50 watt marshall jmp mkII head through a modern marshall 1960 cab. The amp was running at a very high volume in a band rehearsal room. It was one of those simple yet toneful solos that made the rest of the band drop their jaws, I was delighted too. I wish I had gotten a chance to record it. Ever since then I religiously keep the pickup booster near my amp.
You can run 9-12 volts into it, it gets +6 up to +26 db of gain, battery life is okay. I don't really use the Pickup resonance switch though.
Word of caution, the screws are easily stripped. Given a chance, I'd love to try this pedal with other mesa amps, especially a blue angel.