Costco: Kirkland Cat Litter...good or bad?

I have 2 cats and the BEST litter that I swear by is Arm & Hammer super clump formula. (I get the unscented). People have come to my apartment and are amazed that I have cats. I've been told that you wouldn't even know I had cats if it weren't for the present scratch post and the food/water bowls. There is absolutely no scent in my apartment! But you have to remember... regardless of what kind of litter you use, you have to clean the box frequently! The A&H litter is pretty cheap if you go to PetSmart. =)