Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Poor warranty service -- avoid Panasonic

After 3 returns, I finally gave up on them. I got stuck with a lemon model, and they knew it was a lemon model, yet they would not upgrade me to comparable model. In a span of 9 months, Panasonic Warranty Service sent me 3 "factory refurbished" replacement cordless phones that could not hold a charge; total talk time would be less than 10 minutes. I don't have the time to deal with them anymore -- they win. Buyer beware.