Well, it’s installed. The site runs, though a few things are different.
Some of the plugins used with WP 1.2, for instance, have not been updated to function with WP 1.5. Even some of those that have, have not been updated well. PageNavi is one such plugin–at the bottom of every page used to be page hyperlinked numbers, allowing rapid navigation to different pages.
I found a couple of bugs, too. For example, regardless of the post ID, two posts with the same title will create a foul merging. This happens even with draft status posts–I watched a draft go live all on its own as part of the same page as another published post of the same title. Not good.
I also haven’t re-customzied the admin interface. I just don’t have the time at the moment to do that or much else. I still have to upgrade my other WP-based sites.