The best thing about gerrit is that it's free, open source software which can be used to host your own private git repositories with its inbuilt features like reviewing changes before merging them into master branch or other branches. It also has some nice plugins available as well which one could use to enhance their experience while using this tool. I have been working on gerrit since last 3 years and i find nothing much wrong with it but there are few things which need improvement over here.