It will going to take ages to give back you cash. it is not one one of the best cashback website. Lafalafa is much more better than gopaisa.com and much more faster than gopaisa. Lafalafa is even paying much more then go gopaisa.com
But the positive points of gopaisa.com are
Better user interface with more interactive options and cracking graphics.
Lots of options to redeem your payment you can even directly redeem to pay TM
Overall on the conclusion I can say that if you want fancy look and feel when you can go for gopaisa.com but if you really want to get some cash back then lafalafa is much better. Decision is always yours.