Basically he says this $400 thing sounds as good as the $20,000 German Stromtank goodie which was better than the PS Audio P20.
I use one of these on my modified Oppo 205 with great results. I mod it by removing most of the chassis and removing the heat sensor under the battery so it runs cooler and the fan never comes on. Also, I hardwire my power cord into it and use a PPT Stopit in one of the unused AC outlets....very, very good sound.
I am going to buy a 2000 Watt low distortion pure sign wave inverter for my class D amp and tweak it out too. Should cost me around $800 total including battery and charger. At that point I will be off the grid completely.