My kids would devour the Whiskas if I let them - they get it as treats only. I feed the Nutro Natural... and that has helped a thousand times over with the smell. I didn't believe the package, but its true. You'll find the deposits in the litterbox are less smelly too.

I let mine out on the second floor balcony. One word of experience: CAT PROOF! Pouncer fell off several times last summer, ultimately ending with a broken paw. He's too fat this year to fit through the bars Anyway, they LOVE the balcony. Pouncer sits and cries to go out as soon as I'm up in the morning, and until I go to bed at night. Most of the time, I let him have his way.