I got my blue-light Cot50 in the mail last week and had a chance to compare it to my well loved red-light lil' china Cot50. I was unceartain how much a change in light color could affect the sound. I can definately say there is a difference. The blue is a bit softer in the attack and has less of a upper mid emphasis than the red. The grit on the blue just seems more spread out through the highs and lows like a mild fuzz. It's a very nice sound, but doesn't have the same pushed mid presence that I'm getting from my old cot50. I also recently won a Lovepedal one knob Balance fuzz of the 'bay. Another great pedal from the magicboy! This thing can push some serious db's and has a great feel to it. Maybe it's just my ears, but at their lower settings the Cot blue feels closer to the one knob Balance than to the lil' china Cot50 red.