Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Very dissatisfied with quality of Playmate

I bought one Alesis Playmate last year and had to return it right away, as it wasn't working properly right out of box. It was replaced by another one, which started to malfunction after only 7 months. The product would sometimes rapidly change keys by itself when playing CD's and sometimes would not start playing the CD unless turned off and on. Since it was under warranty, I brought it to the service center, who could not recreate the problem, saying that they couldn't fix it if it wasn't broken, despite my protests. Alesis refused to replace the unit, even though it was less than a year old. I am now stuck with an inferior, malfunctioning piece of equipment.