Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Before you buy

Before you buy from this company, try to contact their customer service department in case you experience any problems in the future. I'm not sure a customer service department really exist at MPIO. Unbelievable. I've been trying for months to no avail.I liked my MPIO because of the small size. But the display disappeared after nine months(and the manual isn't well written). Without the display,I have no way of being sure what I'm doing when I push buttons. I've given up on them. After calling and emailing tech support for five months, I'll go with a company that demonstrates that the it truly values its customers.