Two unrelated questions regarding NetworkManager and Spacewalk.

Newbie here! Currently I'm learning all about RHEL administration. My first question is: do you guys use NetworkManager in your enterprise environments? If not, why not? I find it easier to manually edit the network-scripts and what not so I'm wondering what the professionals recommend.

Second question: Do you guys use spacewalk? I am still learning what it is all about but I read somewhere that katello should be used instead. Is this true? I'm trying to learn how to set up spacewalk correctly and I'm wondering if it's worth the time and effort.

Thanks!