Originally named because it takes up just one electrical output spot, the 1 Spot offers a 9V DC output, with 1700mA of current available.
It lacks multiple isolated outlets like the rest on test, but this useful wall wart will power multiple pedals if you daisy chain them.
Five- way and eight-way daisy chain connectors are available, as are plug adaptors - the system is probably best bought in the Combo pack version, which pairs the 1 Spot with a selection of cables.
The 3m cable on the 1 Spot means you could keep it out of the way, next to your amp, minimising stage cabling.