I forgot to add that I got the large size by accident. I wavered back and forth between being horrified at how huge it was and being happy that it will be a nice comfortable roomy place for my kitty.
I've gotten used to it completely, and I don't think it's so freakishly huge anymore, but be warned when you buy. The large really is quite large.
I guess part of it is because 1/4th is blocked off for sifting inside so it makes sense.
Its definitely easy enough for kids of any age to use. If they're old enough to trust not to play with cat poop, they're old enough to scoop this box.
It's enclosed and there's no filter, but I don't notice any smell and I use unscented clumping litter (Dr. Elsey- not the cat attract- just the regular litter). I don't know if that's the litter or the box to thank for that or the fact that it's always so clean because it's so easy to do.
I roll it and empty when I wake up, get home from work, and go to bed. Without fail his majesty is always waiting to christen the now clean box. I don't even think he has to go - I just think he likes watching me work.