I've thrown myself over a year, with the mythical orange plastic container sold to you in the Chinese, holding up unpleasant smells and sweeping every two by three pebbles all over the kitchen. Tired and recommended by some friends I decided to buy one full covered and found this model at a very good price. A blast! It wasn't hard for the cats to get used to it, and at least for me! Nothing about having the whole kitchen full of stones and smells. Ideal size, does not overoccupy and maneuver well. Now there are only a few little stones that stick to their legs when leaving, but for that I read that there is a small doormat that will be the next thing I bought. 100% recommended! thank to pet cartel 