I installed the B-Booster mod in my Combustion about a week and a half ago. Installation is extremely easy. Sheldon provides an installation sheet with clear, full-color photographs that detail the process. You'd pretty much have to ignore the instructions to make any mistake. It's a bit hard to do an instant A/B comparison of the before and after sounds, because installation necessitates removing the pickups from their routes[color=#FF0000:1z167n3w]*[/color:1z167n3w] – so in the process, you lose whatever pickup height adjustments you have previously set ([color=#FF0000:1z167n3w]*[/color:1z167n3w]you don't de-solder the pickups, you simply unscrew them and temporarily lift them from their cavities). Once I got my pickup heights back to where I wanted them, I was able to do a rough A/B in my head. To me, a low B-string always sounds a bit quieter than the others, just because lower notes are harder for our human ears to pick out – kind of a real volume versus [i:1z167n3w]perceived[/i:1z167n3w] volume thing. Before installing the B-Booster, I'd say that my string output was perfectly balanced, but because I like the B to be a bit [i:1z167n3w]louder[/i:1z167n3w] to offset the difficulty of hearing low notes, I had the bass side of my pickups raised higher than the treble sides. With the B-Booster installed, the B-string is louder, but only in a pure, musical way. It doesn't make the B-string sound uneven with the other strings, but it does boost it just enough to make up for the perceived lack of volume in lower pitches. To me, this makes a "just right" balance, and the B in no way comes across as "too" loud. Is it crazy to say that the bass is "[i:1z167n3w]more[/i:1z167n3w] balanced" now? Whatever the case, the bass sounds better than ever now. I did this on a day off, and after I did the install, I just played the Combustion for about five hours straight, just going to town on the even-more-powerful B-string. It really is fun to play. I really love the change, and am glad that Sheldon is making it standard issue on the Mark II Combustions.