I am using 1 ton Panasonic Ac since 2012 and till now it has been cooling my 11 by 14 Room very efficiently in 25 minutes to 26 temp @46 -48 Degree temperature.
Although my dealer from where I bought was not good but still Ac is up to the Mark.
About the service I could say no servicemen are perfect and good that I have understood with my experience since I am using Acs for the last 20 years
Cheersssss.
Lg, Onida, Hitachi, not even cloe to it