I was in need of an extra power supply on my board and bought this one to see if the dual functionality would be useful. I've usually used clip on tuners on my guitar, but I like the way a tuner can mute an entire board when put on the end of the signal chain. The Harley Benton does its jobs very well: It tunes my guitar, powers my pedals, and mutes my board.
I've not challenged it's role as a power supply too much and I don't know how it'll fare with more demanding pedals, but I haven't found a glitch yet for my lighter use.