I have one of those 1 Spot adaptors and it works great with all my single pedals. The only thing it doesnt work on is my Digitech RP300 processor. Have to use a seperate adaptor for that. Hope this helps.
Yeah, that's what I'm using the Boss one for, outside of the SD Twin Tube Mayhem and Digitech Black 13 and Red Special pedals, which all have to use their own adapters.