I have literally tried all of these viral giveaway platforms, including Rafflepress, Vyper, Wishpond etc. I always come back to Woorise for its simple and quick way to set up a good-looking giveaway. And it has all the features I need (including fraud detection, which is a big one). Go look at the price of Vyper and Rafflepress and you will see that this is an excellent deal and a comparable product. Maybe not as developed yet, but since owning I have seen Woorise develop further. So I am confident they will continue building this into a leading product.