Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great idea, poor design

This product was easy to assemble and worked well for a few days. However, the weakest feature is the way the green top is fastened to the bottom. Sliding plastic tabs hold the two together but easily come loose. If you don't notice when they are loose, you wind up with litter leaking out of the box when it is rolled over for cleaning. Also, one of the tabs on my box broke off after only a few days. I would drill holes and insert bolts in the lip between the top and bottom to hold them together securely, but the design doesn't make it easy to do that.