I scored an old MIJ Boss SD-1 for a song so I figure have it for 'collecting'. I compared it to my Fulldrive and it goosed my Marshall just the right way and knocked off the Fulldrive from my board! Yes, it cuts a lil low end and may not do all those switchy things, but it just sounds good! The fulldrive almost sounded muddy in comparison. Now, the FD does win into a clean amp, but that's not the goal of my overdrive use, but many do that.
Over the years my board is becoming more and more... Mass produced... And... I love it.