It works but the cats hate it!
It removes loads of hair (and will also cover yourself and any furniture, so create a space or groom outside for least amounts of hassle). However, my two short haired mogs run away from it and one actively tries to bite it - not keen at all, despite loving normal strokes and scratches. So yes it works, but I only traumatise the cats about once a week as they dislike it so much!