I have a few packages installed from the Third-Party repository using the instructions from the wiki.
However this packages don't get updated or even notified of new versions, I had to check manually and run the install process manually to update them.
Steps to reproduce:
- Install some software from the Third-Party repo, i.e.: Chrome Dev Channel
- When there's a new version check Software Center, and notice no update available.
Software Center has metadata for the Third-Party repository and keeps track of the installed packages, and offers updates for them automatically.