mostly i use zebpay for buy btc.yes this trusted and fast send btc.
the best way to buy a bitcoin inida with securely Unocoin & Zebpay i think coinsecure (i never tried)... In zebpay u ill get some discount vouchers also
Thanks for kind words

We constantly tried to get bitcoin prices in India at par with world prices, to make sure new users does not need to pay premium to enter into bitcoin. Mostly we were able to get overall market prices corrected and we are seeing great volumes and business because customers like you

I believed if you want to buy bitcoin for investment and all legal purpose, going with exchanges and reputed seller at localbitcoins with bank transfer is best way to do it. That way you can always prove your purchase.
Thanks and Regards
Mahin
Co founder, Zebpay