I have 3 cats and each one has their own brush.

Terra has the horse-type brush described in this thread. She's a double coated short hair and this brush works wonders. She also loves the way it feels.

Misao has the zoom groom. She's a single coat short hair who's still a little timid. I think this brush is soft enough that she doesn't know it from my hand petting her.

Hana has a straight comb. She's a long hair with a terrible tendency to mat. She's also fairly timid and this is the best we can do for her.