There are a couple of issues with the default settings (in my experience)
After installing gitExtentions vsix - the GitExtentions toolbar does NOT become visible by default
In almost all cases that I did enable it manually, by right clicking on the toolbars and checking the GitExtentios, I do get a duplicated view (with all the buttons being show 2-wice)
(not sure if this is for everybody, but I need to enable this toolbar manually every time i start my VS :(
There are a couple of issues with the default settings (in my experience)