The ability of building mobile apps without programming knowledge.The UI/UX design part was very simple like drag drop elements from library or use pre built templates which helps me create an awesome looking product out of nothing! I would say they have great support team who are always ready for help if needed during implementation stage.There are some features i still haven't found yet but as long as its free trial version available then there's not much issue.We used wavemaker builder toolkit only once so far and did build few small applications using this toolkits. Nothing at present time because we were able to get everything done within couple days just through writing codes and creating user interface (UI) screens.