One of the main reasons for doing this upgrade is the ability to use XML Sitemaps and robots.txt. These help search engines index your posts.
I found this post on upgrading from the QuickStart for the OpenShift platform which hasn't been upgrading in 5 months as of this writing.
If you run into any problems, don't forget that you can always use the rollback command in git once you find which commit you want to rollback to. You just use the following command:
rhc deployment-activate 9f37d551
In this example, 9f37d551 is the name of the commit you're wishing to roll back to. It doesn't matter if it is the most recent commit. You only need to be able to find the hash of the working commit.
You can read more about how to do this here.