Got one of these at the same time as the Wah. Been using it for almost a year now, out in the wild every couple of weeks. Had absolutely no problems with it. Set up and forget.
One thing I would say tho, and this isn't the fault of the power supply, is that the socket on the pedal is in a *slightly* awkward position: sometimes the cable for the power supply can get between the treadle and the base of the peddle.
Haven't used my wah pedal for about 10 years due to losing the power supply for it!
The second I plugged this in it worked perfectly. Really good build quality and very compact, lead is long enough for any use without having to extend. All round a quality product and wouldn't hesitate recommending to anyone.
Does what it says on the tin. I have used it and it performs well, beats having to change batteries every time you forget to unplug the pedal. Don't anticipate any problems as, even when left plugged in for days at a time, doesn't seem to get even warm.
This was the wrong adaptor and i therefore assume that my pedal was an older model and required a different connector. The result is that i have a power supply that does not fit the cry baby that i possess.