Ok, I connected the SDS, which was pretty simple. I used the strobe disc to check proper speed (though I don't think it was absolutely necessary), and listened to four sides: one each from Yes; Bola Sete; Blood, Sweat & Tears; and El Chicano. The records all sounded as I remember them sounding, so the setup is good. Good enough, anyway.
As for an improvement over putting the VPI table straight into my LCR2400, I won't say I heard any big difference. I got the SDS more for control than anything else, as it means I don't have to move the belt around to go from 33-1/3 to 45 rpm speed.
VPI, Grado, SME, Pioneer Elite, Magnum Dynalab, Oppo, DVDO, McIntosh, JJ, Mirage, Kimber, Transparent, MIT, Pangea, Wireworld, Shunyata, PS Audio, Furman, Sanus