LOL....The SEM to me was too harsh and buzzy sounding due to the LEDs...I don't use LEDs to generate my distortion...I also don't use mica caps which I feel add a sought of "hi fi" sound to the pedals...I want smooth,tubelike,analog tones from my pedals..
Can't comment on the other DS1s,but my DS1 just smokes the Keeley SEM DS1....
John