Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Nice idea, poor execution

The sensor and lid work great; it's the rest of the can that is poorly made. The main lid does not fit well on the metal can, and the plastic ring to support trash bag does not fit securely within the metal can, so the heavy lid sometimes tips, and the trash bag often slides down into the can. The trash bag ring is held only by friction within the walls of the can, which is not strong enough to support a full trash bag.