Accidentally I stumbled upon AppSumo about a year back through a search engine result for a lifetime deal (I used to buy from Stacksocial's affiliate platforms, which was only I knew back then). Took a decision to join AppSumo + Briefcase and since then onwards, have bought tons of tools for specific need. All those 10% add up to a significant amount by now. And I can say AppSumo has become the #1 digital marketplace amid competition from other known players. Good part is reviews and questions help a lot. Some vendors are very actively answering questions and doubts, sometimes some questions remain unanswered and in doubt, people lose confidence in product and tend to drop that deal. Having said that, the interactivity is a real must and very helpful to make a decision in buying which I saw missing on other platforms. So, AppSumo Rocks! Happy customers! Happy vendors! Win-Win for all :).