Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Customer Service

I ordered the cordless Waterpik, it arrived in record time, but it only held a charge for a week and then quit altogether. I called Waterpik and they immediately sent me another one, but that wouldn't pump the water, so I called again and decided to get the electric model. It arrived in record time and I love it. It's much easier to handle, the reservoir holds more than enough water, but to my mind, the biggest thing is the customer service at Waterpik. Each person I talked to was friendly, and very, very helpful. I don't know when I've been treated so nicely.