Hello delhiuser
I also bought TP-Link W8968 ADSL2+ V3 2-3 months back and I must say this router has issues.I will not say much as you have made mood to buy.
Frequent wifi dropouts,refreshing browser again and again to make webpage open is common.And as per the 5dbi antennas are concerned lol at this router.

My 5 years old Utsarcom supplied default with BSNL is good.Just view these links.I have tried all..SNR margin,firmware upgrade etc etc but problem persists.Maybe my piece is defective but after watching reviews i think my piece is same as others.
I have to reboot it many times to make it work
Just go through links and you will see many users are having problem.My problem is similar to these
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TP-LINK TD-W8968 300 Mbps Wireless N USB ADSL2 Modem Router Review by chandan kumar esanakula | Flipkart.com
TP-LINK TD-W8968 300 Mbps Wireless N USB ADSL2 Modem Router Review by Aditya Raj | Flipkart.com
TP-LINK TD-W8968 300 Mbps Wireless N USB ADSL2 Modem Router Review by mani | Flipkart.com
TP-LINK TD-W8968 300 Mbps Wireless N USB ADSL2 Modem Router Review by Vishal | Flipkart.com
As far as TPLINK is concerned i just love their products.I am using their many products from last 5-6 years and they are jusy good.I have TPlink wifi usb adapter, pci-e x1 lan card
i think this router is bad.As i do job i dont get time to get it replaced.So i have plugged my old modem again