Need Cat Owner Advice

Have any of you tried that self-cleaning cat litter box? Are they any good? I've been thinking about getting one. I swear this cat craps more than I do.

Oh and he confuses me. He acts like he loves me... follows me around like a puppy, jumps on my lap constantly, curls up on my chest. He's relaxing on my lap now as I type. But then sometimes when I go to pet him he claws the shit out of me. When I walk by he attacks my legs. I try to clean his nose or his butt and he bites so hard he draws blood.

I know all cats do this to some extent... well all the ones I have known. But usually like you go to pet them and it's just a gentle warning bite that says I don't wanna be touched right now. This cat tries to rip my arm off. His name is Chloe by the way... I've tried to avoid saying it in this post cuz the fact that I thought he was a girl at first embarrasses me, but oh well. I swear I never felt a penis or anything... I found out when I went to get her spayed and when I saw the bill it said he was neutered. I called the vet and was like um it says here my cat was neutered but I always thought she was a girl. She put me on hold, came back and said congratulations it's a boy!

But anyways... about his agressiveness... any ideas?

Sorry so long.