I checked Gerrit before and like its philosophy of enforcing atomic commits and linear history, but I do not like its way of adding special change id in commit message and push to refs/for/master. That makes new users confusing and makes it difficult to follow. So I build a gerrit gatekeeper in GitPlex to enforce same rule in pull request, that is: when you need to update a pull request, you must amend your previous commit followed by a force push. No special change-id or the magic refs/for/master will be necessary.