Fedora, Up2date, and YUM

I installed Fedora on my son's computer on Sunday and for the last two days I have been trying to update the files. I have not gotten the up2date program to work consistently for me. It appears to hang up while trying to download the first 30~50KB. It was giving me gpg errors yesterday. I have had more success with yum. It gets an occasional bad header and restarts but it typically will run to completion if I am upgrading only one package. Fedora is very nice but not quite ready for prime time.