Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Excellent performance and Excellent Xicar warranty

I bought my lighter for use with cigars. After six months of use (with triple-filtered butane), one of the burners started to flicker, and then quit. A few weeks later, the other burner started to falter as well. At that point I sent it back to Xicar for warranty. Within a week or so I got a brand new lighter, and it has been flawless ever since.