I have no personal experience on this, but I assume its the same as the hydrokit scam for cars thats been proven on various tv motor shows and even Discovery channel - Mythbusters, to not work.
From the looks of the kit I could knock one up in my kitchen from a blender, some wiring and a sprinkle of magic fairy dust. Lol.
Says full refund givenif not satisfied, yeah right, just try getting your cash back. Up to you, you pay your money and take your chances, I wouldnt tho.
Its worrying that the comments section is closed now also? Too many bad comments given maybe?