There is no doubt that the product is really good. The sleep function works like a wonder in the night. I think the outdoor unit make a bit noise. The one thing which I didn't like is the service engineers that Samsung had sent. The people who came to install the product was all local technicians and not an employee of Samsung. They must have outsourced that to the local technicians. The quality of the technicians are not up to the mark. In this ground I really appreciate LG over Samsung. I bought this product due to competitive pricing that the Samsung is offering on an inverter AC> Apart from that the AC works really nice and can cool down the room instantly. It has anti bacteria filter which is useful in today's world. Though it's 3 star rating, it should be more energy efficient in compare to a 5 Star non inverter AC.