The plugin works great and saved me hours of time, I do however have a couple of suggestions for you.
1. I exported my pages into XML format and noticed the pages that were created through your plugin were missing the wp:postmeta information. Not a huge deal, but you may want to think of adding that data.
2. Using "-" can be problematic when adding hyphenated words.
Give that particular character is used by WordPress for its URL structure, I might suggest using something else if possible.