Instruct: Classify Amazon reviews into positive or negative sentiment
Query: White Flecks in Coffee Grounds After 4 Months

I don't believe this is a very good machine for first time users. In order to get a decent shot, you need to play with the grind and timing. The thing has a horrible steamer system that required you to pull up and down on a tiny plastic grip that becomes increasingly intransigent. I'm on my third part replacement after 5 months. Now I'm beginning to see white flakes that look like metal oxidization in my coffee grounds. I would suggest this machine for very occasional use and with the knowledge that it will take a lot of time and effort to maintain and will need to be replaced as soon as the warranty runs out.