Hi at all

I'm almost new @ the openSUSE community, i hope you can help me. I've installed openSUSE 12.1 on my ASUS laptop, and it works like a charm. ATI driver, wireless, it's all perfect but, searching on the openSUSE site, i saw i can add / remove some OBS (build services) repository to keep my system updated (specifically, i've added virtualization, PHP, python, KDE-apps packman, tumbleweed repositories). With a zypper dist-upgrade i've upgraded the whole OS. I can broke something use these repositories? it's correct to keep active all together?

Sorry for my english, thank you for the reply