Instruct: Classify Amazon reviews into positive or negative sentiment
Query: "self cleaning" litter box

I have 3 cats and it has been a challenge to keep the 3 litter boxes clean...not to mention keeping the odor to a livable level....this one box (the large size) has lived up to its reputation...easy to put together...easy to roll...and the lid keeps the odor under control...I am very pleased.