I honestly think you can get more hair off the dog with this tool than the dog had before you started.
I know what you mean. I thought people that were raving about it were lying or brain damaged. I de-thatch a golden retriever with it and every year could probably spin enough hair into yarn to knit a sweater. Unfortunately, I am told that dog hair is too smooth to link into strands so it make poor yarn. Oh well, the several grocery bags of hair provide a lot of nitrogen for the compost pile.