Instruct: Classify Amazon reviews into positive or negative sentiment
Query: GOOOOD sound for the money

I have learned the hard way.!! The cd player on my 3 year old PROTON unit was no functioning and decided to buy a SONY 500 series so-called compatible unit. I installed it quickly found out that the PROTON sounded FAAAAR better. So I returned the SONY500's unit and decided to clean the Proton's CD player... it was worth the effort after what I found out from the competing products. After a good cleaning it now works now JUST FINE. I would recommend this unit... It has 5 watts of audio power.... FAR more than all the others of compatible value