Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Caution with factory refurbished unit

Arrived quickly from the seller. It was technically was as promised. Unfortunatley, performance was poor. There was a horrible motor whine. Also the recording quality was MUCH worse that my heavily used, and abused 25 dollar portable unit. My transcriptionist, who almost never complains, could not hear me well (and I dictate clearly).Right now, my M-2020 is at Sony. I had to mail it there for service. Very hard to contact vendor. At least Sony seems to be evaluating the unit (it is under warranty for 90 days).