Reddit reviews Cat Sense: How the New Feline Science Can Make You a Better Friend to Your Pet

Basically, they want to have their own turf. They walk around constantly rubbing their scent on everything cat-height. Indoors, this means 2+ cats will be in an eternal cold war over your house, which is stressful. Their food and litterbox are especially personal. If they're siblings from the same litter, they can stay together and be happy with it, but any other time they just want their own space. We humans tend to project our own feelings/wants/etc onto them (as we do so many things.) Even if it appears, to our eyes, like they're playing with each other or getting along, they usually don't see it that way. Cat Sense takes a scientific look at cats, but it can get pretty dense at parts.

I was pretty certain that after a certain amount of time you could not make a feral cat friendly, and to make a cat person friendly they needed to be handled frequently before a certain time. At least that's what I read in CAT SENSE