I purchased Voltas 1.5 ton 3 star ac in oct 2016. Before purchasing I researched for many other brands ac but found voltas ac as most reliable and less maintenance issues. Though price is little bit more but wo kehte hai na ki " SASTA ROE BAR BAR MEHNGA ROE EK BAR". I am thoroughly satisfied by the product. Till now even after completion of 1 year almost no maintenance or servicing I did even though ac is working like brand new.
I would suggest to go for voltas ac blindly. Forget maintenance or servicing and 3 to 5 years warantee also u get.