Just installed fogifters (Rob modded my boards) in my RM100 and RM50 and I agree with everything that has been said about them before. The presence and density pots are more usable, no harshness or boomyness at all, no real boost or cut in amounts of treble or low end, just more usable. The thing I noticed instantly was that everything sounded clearer. Like mud (or fog..) was removed that I didn't even know was there before. Every module sounds nice and clear. Very worthy upgrade for the low price. Thanks again Rob!