The ease of use is one thing that I like about this software, it's very easy to learn how everything works so you can get into working with your data in no time atall! However sometimes there are some problems when trying different things out or if something isn't quite clear enough for me as an end user (which could be improved).
So far i have not come across anything negative but would say try using datanitifiy before making any conclusions because they do work hard behind their products!! Data collection has never been easier than now thanks to Datanityfy.