There is a great deal of hype about O general Air conditioners being better than time tested products like Carrier, Hitatchi. I purchased a 1.5 T window AC from O general and due to the hype in the market, chose it over brands like Hitachi & Carrier.
Initially a person gets carried over by the strong blast of air flow from the unit which is much more than other brands but forgets to notice that the cooling is lower than other units. So as long as the flow is directed towards you, it feels very good but the moment the air flow direction is changed to other direction, the discomfort starts due to its low cooling. The performance further deteriorates over time as the air flow drops due to wear & tear.
I had a similar experience and when I noticed low cooling immediately after installation, I initially thought it could be my wrong feeling but by the time it completed one year the cooling had dropped considerably and on complaining to the company was told that the unit needs gas charging and I will have to pay for it since the warranty period was over. So to avoid falling into this trap, please do a thorough check of the unit before making a decision to buy.