Instruct: Classify a review as either positive or negative.
Query: don't buy knock off bulbs

I was very dissatisfied with the quality of these bulbs.It only lasted about 100 days with average use and when i contacted margin mart they acted like they cared less.They kept pushing me to contact amazon to take care of this problem which they did by giving me full credit, kudos to a great customer service at amazon but as far as margin mart stay far away.