This is EXACTLY what I needed for an outboard OD with the RBI. It sounds amazing with every single bass I own, doesn't suck the lows AT ALL with the blend, and does everything I want it to do. It's gritty if you crank the gain and warm if you leave it at noon. I found the best setting was with the gain at about 3:00 and everything else at noon. It warms my tone and adds some bite with my flatwound P. It turns my EMG equipped ibanez into an absurdly aggressive but not even remotely harsh monster, even if I dial up the tone on the SD. I switched it on after my micro POG, micro Q-tron, Bass Muff, before/after my ODB-3, and found it subtle, organic, and just amazing with everything. I thought about the Keeley mod but honestly, after trying it out with the RBI, I don't want to touch it or change a single thing in my rig. My RBI drive is set to noon and even with the flatwound P, I just don't need more gain for any conceivable reason. It's also really easy to get a flat EQ out of the pedal. This is a huge plus with my rig. I use a Rane equalizer and leave the RBI flat. The Sparkle Drive can easily give me more RBI tone without changing my presence in the mix. I feel like that presence and EQ change is precisely what turns a lot of bassists here off when it comes to effects pedals. It just doesn't sound natural for the bass to spontaneously leap into another frequency range, and further, it makes it nearly impossible for a sound guy to mix the band unless he's really familiar with the material. I used it at practice yesterday and my guitarists were overcome with envy, demanding that I strip it from my board and let them try it out. It's just as ridiculous and versatile on guitar, and compliments chorus and autowah very well. Tons of attack with the clean blend, no mud, and still really original sounding if you dial in less subtle settings than I'm using. One of them is selling his tube screamer to get one of these now. This is my favorite pedal that I've ever purchased for a guitar, bass, or keyboard rig by a long shot. I would feel comfortable using this on a majority of the band's material, and can easily see myself using it for funk, rock, blues, whatever. I am so glad that I didn't get the fulltone or the VT. The Sparkle Drive is perfect with the RBI. For the money, I don't see how you could possibly beat this thing. It may not be as versatile as the VT, but if you don't need amp modeling and you just want a simple overdrive that doesn't detract from your normal bass tone, you can get incredible results from this with the clean blend (by far the best/most defining feature of the Sd). Go buy this right now if you're running an RBI.