it is not the best! it is a decent PPC. i have used several of the Adsense alternatives, and the results have been mixed bag. i have used Majore ones like Bidvertiser, Clicksor, etc..and the smaller ones like the one you have mentioned Vadpay, Chitika etc. it all depends on the no. of visitors you are able to bring to your site, if the no. of visitors are good, there are chances of you making good money fast! there is no other magic trick