Well, I happened to find a fellow gearwhore (not from this forum), and we got together for a gearfest. Anyhow, he had an RC booster, and hearing the great praises I've come across, I just had to A/B it with my Super Chile Picoso. He was kind enough to let me borrow it, so here's what I've found after about 30 minutes of playin with em. Signal went: Les Paul -> RC Booster -> SCP (tearfully pried from my board) -> Marshall AVT275 clean channel (I know, I know. But I get it to work for me, and it sounds great). I didn't stack the 2 pedals, tried 'em both out one at a time Setting Number 1: It wasn't too hard to A/B the two, as the SCP only has 1 knob. I tried to set the RC Booster as transparent as possible, which meant turning down the treble knob a bit (about 10:00), bass at 12:00, little bit of gain, and level at unity. For the SCP, I also had the knob at minimum (unity). The SCP, IMO, beats the RC, though the RC is a great pedal. If you want an always-on type pedal, I'd recommend the SCP, as it adds a sparkle that is not so easy to define (something in the mids), but it really brings out your note clarity. The RC improved the tone as well, but it wasn't as noticeable. Setting Number 2: This involved using them both as a lead boost. For the RC, I turned up the gain to about 10:00, and turned up the volume to a suitable boost, equal to the SCP's knob at 2:00. I turned up the bass knob on the RC as well in order to provide some extra thump, trying to match the extra mids the SCP provides. Again, the SCP won out. The RC just couldn't hold a candle to the SCP in bringing out note definition and making my tone sound more full and clear. Conclusion: If you want an "always-on" type pedal to enhance your tone, go for the catalinbread. If you want a flexible lead boost that goes from ultra transparent to little bit of gain to treble boost to whatever, go for the RC. It is a great pedal, and worth the hype. But if you want a lead boost with note definition, sparkle, and tone improvements, I can't praise the SCP enough. These are my findings, and I'm sharing them. Feel free to debate, or trash my choice in amplifier or whatever! Btw, stacking the RC booster as a low gain (with the gain knob maxxed) and the SCP gave me a great low/mid gain overdrive sound. These two pedals stack together really well. I want to buy a second SCP to leave on all the time, but I'm thinking of buying an RC booster, using that as a transparent lead boost, and put my current SCP first in line and always leave it on; as I do not know if two scp's would be overkill.