I would recommend this for "casual" use - meaning jamming or playing with friends. But since it's not isolated, it's possible that noticeable electrical noise is introduced if 3 or more pedals are connected (I get a very noticeable sine wave hum at around 2.7 kHz). So it's not great for recording. One star deducted because of this.
I will deduct another star because the connectors in the chain are indeed very close to each other (15 cm). If you want to connect, say, a Boss pedal and a CryBaby after that, you will have a lot of trouble getting the chord around the CryBaby.
Of course the price is very low, so you really cannot expect much at this price point. Overall, you get a fairly usable power supply with a bit over 10 EUR.