[Wlug] Adding repositories?

I've added a new repository (or two) to my yum config, and I'm feeling a bit exposed. I wonder what other WLUG members do about additional repositories. In an effort to support vlc, I had added the livna repository, and when that stopped working (after recent fedora updates), I found that switching from livna to dries helped. Now I notice that there are quite a few packages from dries that will update fedora packages. So, I'm feeling a bit worried. Does anyone have a sense of how much these repositories should be trusted? TIA, Bill