See MTECH from IIT will definitely boost your mental caliber to a high level. After two years of MTECH you will surely become a more capable person who can handle variety of problems and provide best solutions to them. Also during your MTECH you interact with the best minds of your country which gives you lot of exposure to learn and be a better version of yourselves.
Also you will be very good in your field . So getting a good job will not be a big issue for you then. You can get R&D jobs in campus placement itself. If you want to go for higher studies abroad you can easily get it as you are having IIT tag and this tag have a great value in the international market.
So overall your life is going to a higher level after doing MTECH.