I am currently running version 2.5 on my wordpress sites. Now that 2.6 is available I want to update but I have heard stories of customized sites having trouble with upgrades.
I have done a bit of code manipulation to them so my plan is to back up all the current files on my hard drive and then upgrade. This way I can easily revert the sites back if need be.
I figured I would ask a few questions first though:
1. Is it worth it to upgrade? I mean if the site is working fine and has the features I want, what is the point?
2. Is there any way to tell in advance if the customizations I have done will affect the site after an update, is there a list of changes published anywhere?