My coworker used it till his HDD broke, taking his key into data heaven. The repository is still online thanks to radicale, but he has no way to ever get push access to it again.
So it is useless as any misstep can potentially kill your access to the repo.
It is unfortunately developing very slowly and it is impossible to interact with git repos... which nowadays is basically every repo:-(
Take a look at jj. It is not as ambitious, but develops faster and you can use it with any git repository out there (as long as it does not need git submodules that is).