I got this Ondia 1.5 T A/C 6 months back
Why Onida?
I got another Onida A/c for around 3yrs and its working fine, no issues so far. It is reliable, good cooling and cheap moreover Onida comes with compressors that are build by subsidiary of Hitachi know as "Highly".
Service
IDU of the new Ondia A/C was making squeaking sound after 1 month. I called the service center and they sent a technician the next day and he identified the issue to be with a "Bush", he said it needs to be replaced. Now for the replacement I had to make 3 follow up calls with service center and it took almost a week. The sound went off and so far so good.
Before buying an A/C always check as to how is the service of the particular brand in your town/city. Most of the issues related to bad cooling, water dripping, gas leakage are caused due to improper installation, so ensure that the technician leaves only after you are satisfied with the installation and cooling.
If you got extra budget, then its better to go for Hitachi, Carrier, Daikin, O General or even Voltas. These units are much better than Onida/Samsung/LG and should run without issues for 7 to 8 years but if you are looking for a decent A/C that does not burn your pocket, then go for Onida.