I have picked up a few Boss pedals, and been trying to learn how,(and when) to use them. I have a BD-2, CS-3, and a DS-1. In their stock form I see limited usefulness. All are either shrill or boomy, the BD-2 would overdrive the amp inputs well, but was hard to dial in the exact sound I was looking for. The CS-3 was very noisey on high settings, and the DS-1 was mainly a fuzz pedal.
I have now modded them all, (2 with the Keeley mods), and they are much more versatile. I put the DS-1 back together last night, and it sounds great. You can dial a lot of the dist. setting before you get fuzz. Prior to that it makes the little 12" combo sound like a full stack!
I just wonder why the manufacturer doesn't include these mods to the production pedals. They are all quieter, have more tone adjustment, and whatever effect they are intended for seem much more controllable.