Blue Star is good, in fact very good. Though I don't own a Blue Star AC, I have seen it operating in my office and in many other offices and shops, etc. I somehow feel that Blue Star ACs throw the coolest air and cools faster among all the ACs, at least the ACs I have used or seen; Hitachi, LG, Panasonic, Carrier, Voltas, Samsung, etc. that I can remember. Maybe my next AC would be a Blue Star. Besides, it's made in India by an Indian company!!
There are several Japanese AC brands available in India; Hitachi, Daikin, O General, Mitsubishi, Toshiba, Panasonic, Sharp.....Carrier & Whirlpool are American brands, LG & Samsung are Korean (LG is better among the two), Blue Star, Voltas, Onida, Godrej, etc. are Indian companies among the reputed brands. Blue Star is the best among the Indian brands, and I would say it is comparable, if not better than most Japanese brands. And you might face service issues with Toshiba, they have low presence in India.
A few more points I would like to mention here:
1. Buy an AC with copper condensing coils and Aluminium radiator fins, avoid Aluminium coils, they suffer leakages and loss of gas, gas filling charges are Rs.2500-3000, and coil replacement charges would be even higher. Some companies use alloys for more efficient cooling, but copper is the best. (Copper is the best for geysers also, like Venus, but AO Smith markets non-copper geysers with cool marketing taglines).
2. Most inverter ACs come with R410A gas/coolant, but still re-confirm once. Old R22 gas will be discontinued after 2020 for environmental reasons, though R22 will have replacements like R417A and R407C, but why take chances. You cannot use R410A in an AC made for R22 gas, as it works at 170% more pressure than the R22 gas.
3. Do not install the outdoor unit under direct sunlight for more efficient cooling.