I am not a frequent flight traveler. But I have travelled some times in different flight services.If compair to others indigo is best for air traveling because of good reasonable ticket price, friendly staffs and well maintained flights.
But they don not offer food for free. Indigo is most Secure and safe airlines for all. Flights are mostly on time.The check-in process is also very smooth.Many people says about its seat and food quality is bad, but my experience with indigo is good, so the review is positive.