Rawhide is mostly fine, particularly if you stick to non-GUI server-ish packages. I know this because I use Rawhide on my laptop [except right now, because I'm testing F18, but I'll flip back to Rawhide once F18 is out]. I also have numerous Rawhide VMs for testing, and for libguestfs we do an all-up test of a Rawhide VM every few days.