Truetone 1 Spot 9V/DC

High-power (1.7A) 9V switch-mode power-supply with a single Boss-polarity 2.1mm / 5.5mm barrel connector.

The two best feature of this product are its Europlug-style space saving design, and the robust cable (two 18AWG wires in a figure-8 cable). Those two things make it worth the price alone.

There are some minor noise issues (not hum; high-frequency) when powering pedals with inadequate power-supply filtering (soldering an extra capacitor or two might be an easy fix, but your milage may vary), and/or circuits designs prone to noise (e.g. transistor fuzz pedals).

I often use it with power-hungry devices like the FEA compressor, or certain half-rack units. Because of its high-power rating, it's surprisingly versatile, and a handy power-supply to have around in the studio; you never know when it might come in handy.

Recommended.