It seems it's location dependent. Even I was a loyal amazon user till last BBD sale.I have always been an Amazon loyalist. Never used Flipkart unless I very much want a product that's not available anywhere else.
Very recently I started using FK only because I started getting those Rs 250/- vouchers from RSDC/RPDC.
I noticed that the prices are inflated and there are a lot of hidden charges on top of any order.
I'm not very happy with the overall experience and I am OK to skip this Black membership.
For me FK and FK mins have always been cheaper than Amazon by considerable margi. Till now FK never disappointed.
Even now amazon shows 800rs for 200gm bru instant coffee, fk showed 700rs. (OMG 2 months ago it was 400 for 200gm , now its doubled.)