J2.5.9 + K2 version 2.5.4 -> WP 3.5.1 using your latest plugins. Both on localhost.
Importing about 477 K2 items and 25 categories. Everything seems to work perfectly (images, hierarchy, tags, content, etc). 2 issues I'm seeing:
1. [major] after conversion, the author pages are broken. I have about 13 content creators and if I click on the author link, can't get to an archive view of all their articles. The resulting links are in this format: domain.com/author/FirstnameLastname but lead to broken pages.
2. [minor] For some reason, all K2 category slugs have a "ck" + a number in front of their names. So for example, "french-classes" category alias in K2 becomes "ck22-french-classes". Looking at these numbers, they seem to be the joomla K2 category IDs. I can change the slugs manually pretty quickly because I have a few categories but it would be nice if it just kept the original alias.
Thanks for an awesome plugin!