This was my first XC upgrade and I have to say (when compared to some GPL product upgrades i've done in the past), this was a refreshingly easy upgrade from .13 to .14. Just needed to patch a few tpl's manually as i'm running a custom skin.
For info, - I did have *one* hitch. After completing the upgrade, I got a 'There is a file permissions' error when accessing any new/patched file. Easily fixed by running the following (from install instructions) with 644 permissions instead of 666.
Code:
for i in `sed -e 's/,.*$//g' < upgrade/4.0.13-4.0.14/file.lst`; do chmod 644 $i ; done
Cheers