Instruct: Classify the given review into positive or negative sentiment.
Query: Designed obsolescence

This is my second Keurig single cup coffee maker. The first was the platinum model and I am convinced that they have a designed obsolescence of around 13 months. I really like the convenience of the single cup as I probably brew 4-5 cups per day. I think you have to either accept the fact that using these machines cost $15/month as a replacement cost. Unfortunately, looking at reviews of other K-cup compatible coffee makers they have the same issues.