Man, this pedal kicks so much butt! I Googled "best edge of breakup" overdrive pedal, and the Gain Changer came up multiple times, so I rolled the dice on it. It sounds so good with my Vintage Sound 15 (Princeton clone)! I prefer the lower gain setting. Depending on the guitar, I either use the SR mode or the flat/fat mode. Loving my Tele in the SR mode with the gain slightly under noon...chicken pickin' heaven! It sounds great with humbuckers as well...very nice with my Les Paul and 335. I seriously can't stop playing since I got the pedal (a little over a week now). I highly recommend this pedal!