We had tried numerous boxes over the last two years as well as different types of litter. We tried the regular cheap boxes as well as the ones with lids on them that had the snap locks, nothing worked. We had problems with the smell & the litter being tracked through the house, but the biggest problem was our dog snacking, which made me physically sick every time I thought about it. Well, let me say, this is the best ever. I clean it every 2 days only because I want too, as it doesn't smell. I don't use any liners or filters as I find that they are just extra work & expense that's not needed. This box has a very shiny interior & I think that is why it scoops really well, nothing sticks to it & when I clean it thoroughly every other week, it just takes a spray with the hose, no scrubbing is needed. The litter does get on the stairway, but rather there than my carpeted stairs & our dog, is terrified to stick her head in there, so there is no more snacking. I just love it. I also use a small blue rubber cat rug that helps keep the litter of the floor as well. The first couple of times, it did take me a few try's before I was able to clip it together but now it's a snap. You just have to line it up correctly. (I would feel better if it had a lock on it, but ?) My husband was surprised with the size of the box that it came in, so do take that into consideration when buying & measure the space where you plan to put it, as it is rather big. To sum it up, "IT'S AWESOME!"