I am not a technical personal who install acs or manufactures it so my review is from my experience of using it since the last 3 winters.
One of my friend suggested to buy this Ac who is using this ac for last 10 years or so. Buying an ac is always a big deal for a lower middle class family so we should invest money more cautiously. Till date since its installation, it didnt even require a single servicing .I have installed a v guard inverter along with it so dat d compressr doesnt get affected in voltage fluctuation.There are acs out there which will probably give you almost d same feature probably in lesser amount of money but better to invest money once in a lifetime& get benefit of it for d lifetime.It cools the air so quikly& uniformly.Run it for 30 mins& switch on the fan dats all is enough for a night so electricity charge will also not b coming much.Dont even think twice before buying it.The only point that I have a complain from Hitachi is the design, it could have been a way better& premium.