Boss SD-1 SUPER OverDrive : Jerald's user review
Same JRC4558 chip as Tube Screamers but sound very different. Has tons of overdrive. Almost a distortion sound. Bitey OD for people that need more dixt/Hi Gain tone. As opposed to Ibanez Tube Screamers you loose some bass/low end but nothing that can't be dialed in on the amp. Great price at $50 new now!