If your are planning to use your phone for 2-3 years then you should otherwise no need. Normally Samsung phones require warranty only for display which they are already giving you for 990 INR(Never mind offer). Otherwise I'm a Samsung user since Galaxy S2(S2, Note 1,2,3, S4, Note 4, S7Edge and now Note8). And haven't faced a problem wherein I have to run to service centre or I require extended warranty. Many of these phones I used for 2 years.
Thanks for being with Samsung and sharing your concern. We would like to inform you that if you want to extend your device warranty to make your device protected in Samsung Under warranty services then please get extend warranty.