It's so great that I started using it just two days after buying my new computer (a late 2015 Macbook Pro), but now about three months later -- still no problems! No major complaints either; everything works as advertised or better in this software package for writing multiple drafts of papers together while keeping them separate files with different names/titles etc., easily organizing all these draft versions into folders by year & month, sharing among team members via Dropbox without having any issues at all regarding file-sharing permissions.
The program was also very intuitively designed which made me feel more comfortable right away because there are not many programs like this out their today, even though most other similar products seem pretty good too when compared side -by-side. My only complaint would be how slow some sections seemed sometimes during editing time due to.