Instruct: Classify a given Amazon review as either positive or negative.
Query: ordered 2 units and both are defective

The title almost says it all. I ordered quantity 2 of the "dual garage laser parking system". They arrived within a few days which was great. I plugged them in to test and they seemed to work fine. I proceeded to attach them to my ceiling and the 2nd beam on both units quit working within the first hour of usage. Simply put - this product is a great idea and represents shoddy workmanship at its worst.