Hi. I am using Panasonic Air-conditioner since 5 to 6 years at my home and from 3 to 4 years in my office. Till date performance ia very very good. When ever I buy any electronic item I mainly focus on maintenance. Nd in this case also I was duly satisfy with the performance of the product. I do not know why it has been so under rated? I 100% satisfy with this product and recommend it strongly.