This is basically the same box as all the other isolated power supply boxes, but at a much better price.
Nothing really much to say- it delivers isolated power to pedals. If you don't know why that's useful: some pedals don't like working with eachother because electricity is finicky (their ground loop wirings don't match), so sometimes pairing up some pedals on the same supply will get you simply unholy amounts of oscillation, noise and crackle- and not the good kind! If you isolate the power supply to the offending pedal(s), the noise will stop. If you have weird noise coming from your trafo-powered pedals and it stops if you drive them by battery instead- that's where a iso supply will help.
Personally I had that problem on my board- my input chain (drive, noise gate, tuner) was interfering with my fx loop chain (delays and reverb) because they ran on the same unisolated supply. I switched the input chain to PP junior, and now things are quiet as a whistle.
And it comes with all the cables you will ever need for it! I can't rightfully say if the internal build quality is better or worse than more expensive ISOs, but it's worked flawless for me, so that's a definite recommendation.