Actually works
I took the chance and purchased it from seeing it online but it actually decreased the shedding of my long haired cat by like 70%. I don't see much loose hairs on the sofa anymore.
It's not going to totally replace brushing. I still brush when I do have time but it really decreases my apartment of those furry, light, flying hairs. Also - a lot less furballs - if you know, you know.