At Saturday night's gig, I ran my Fender RB5 into my Rane DC-24 compressor into my Aphex 204 into my Stewart power amp. That is it. No EQ. Sounded awesome... the Big Bottom feature of the Aphex is truth in advertising. Full disclosure: for perfect balance I probably could've used some EQ... just a smidge of 250Hz to accentuate the higher notes on the G string. Also, the RB5 is passive, and I usually run it in series mode which attenuates high frequencies. For a couple songs where I wanted bright tone I boosted the exciter section, and the resulting treble increase did sound somewhat artificial. Note however that the exciter section was designed to *enhance* high end, not *create* it. A better solution would have been to switch to parallel or single-coil mode, but my goal that night was to put the Aphex through its paces. Finally, as mentioned in the BP review this device can be overused ("tinny" and/or "tubby" tones), but the "Process" (bypass) switch provides an easy reference point. My overall impression: sweet! I played an outdoor gig with just my two SWR Goliath Junior III 2x10s and they sounded HUGE... I could feel the booty! Sustain was also increased... perhaps too much for old-schoolers, but that could be adjusted within the 204 I think. To my ears, my 2x10s retained their punch, but also gained "girth" that I could not achieve with EQ. I'm still learning the subtleties of this device, but the more I learn the better I like it. I wouldn't give the Aphex (nor any other gear for that matter) an unconditional recommendation, nor have I A/B'd an Aphex with a BBE or other competing enhancer device. But I definitely recommend checking one out if possible, especially if your tone is close but not quite there. Bottom line: I was already getting great tone, but even so have decided that the Aphex 204 has earned a permanent place in my rack.