Please look at this:

Size of all updates downloaded from Presto-enabled repositories: 14M
Size of updates that would have been downloaded if Presto wasn't enabled: 32M
This is a savings of 56 percent

Updated: gimp.i386 2:2.2.14-5.fc6 gimp-libs.i386 2:2.2.14-5.fc6 gnome-media.i386 0:2.16.1-4.fc6 gstreamer.i386 0:0.10.11-1.fc6 gstreamer-plugins-base.i386 0:0.10.11-1.fc6 gstreamer-tools.i386 0:0.10.11-1.fc6 gtk2.i386 0:2.10.8-3.fc6 hpijs.i386 1:1.7.2-3.fc6 hplip.i386 0:1.7.2-3.fc6 httpd.i386 0:2.2.4-2.fc6 httpd-manual.i386 0:2.2.4-2.fc6
Dependency Updated: mod_ssl.i386 1:2.2.4-2.fc6
Complete!