Instruct: Classify Amazon reviews into positive or negative sentiment
Query: The product worked great for the first 2 weeks.

I have had this unit for 5 years in my house and have had no problems with it, ever. I decided to get one for my 92 year old father after he tried mine. Ordered the product and all was fine for the first 2 weeks then the tune wheel became hard to adjust and made the left side impossible to hear out of. Went online to Sennheiser 2 weeks ago and filled out their tech support page. To this day I have had no response, so the head phones sit idle. I would have called Amazon but from past experiences I would have been tolld to contact Sennheiser. Its a good product but not this one. 2 STARS