Vantaggi
To be honest, I really cant think of Pros. I was recruited as a Product Engineer. You wont get to learn much. The Glassdoor reviews which says that you get to learn a lot in Drishti, are from Developers(because in case of development you really get to learn a lot), and I really appreciate it, but incase of Product Engineer, you will be learning their own Ameyo tool. You have to work upon that tool. All you would learn is Basics of Linux. What about technologies??? The candidates who have intermediate or advanced knowledge of Linux or System Adminsitration, should definitely not try in Drishti. Product Engineer departments sucks! Learning their own Ameyo tool wont land you a good package after you leave Drishti.
Svantaggi
Already mentioned in place of Pros. By the way, the salary structure of Drishti is a big problem. Suppose you CTC is 5 lpa, that means 40k per month(approximately). If you have this salary in Drishti, you would be credited 34K per month, rest 6K will be credited after every quarter as a bonus. THIS ONLY HAPPENS IN DRISHTI. And yes, Drishti also is no-where in terms of technology! When it comes in technology, Asterisk and VoIP technologies are used. These days, technologies like AWS, Hadoop, Kafka, DevOps, MongoDB, ElasticSearch, Machine Learning are on a boom! Drishti lags behind in terms of technology.