We've had a two cat, three cat and one cat experience. The best were the two and three cat experiences. The two cats were adopted as kittens together (not littermates, both male (neutered)). My daughter had to give up a female cat (spayed) because she began bad habits when they adopted a male kitten.(neutered)), so we adopted her. She got along fine with our two males. I really think it all depends on the personalities of the cats. Could be bad, could be good