NT AC/PSA : You get what you pay for.

I ended up buying this to power a couple of pedals in front of an amp. Sadly it didn't surprise me with it's price-quality ratio, but at least it powers the pedals as long as you can keep ignoring the hum you inevitably get by using this.

The hum already got annoyingly loud with a single pedal connected at all but fortunately didn't amplify with more pedals added to the chain. That changed the second i turned even one of the pedals on. You don't wanna know the amount of hum two or more pedals gave me.

I'm not sure if adding grounding wires to my pedals would have helped, I didn't bother trying since I fortunately found another 9 volt adapter from my house, wich still provides enough power for half the hum.

I don't really recommend this unless you are really desperate for an adapter or you want to use it in something else. I'd rather spend a bit more on an adapter that would be granted for less hum but this one will do well for it's price, if you are prepared for the noise.