The question upload was very useful for us, as we had to upload nearly 200 multiple choice questions. This feature should be also available for other types of questions if possible (i.e. true/false). We also appreciated the question pool option - extremely flexible!
In this project we did not use the learning path functionality of the extension, but we shall consider it for our future ones.
We had only one problem related to translation of the quiz interface, but the support answered very fast and the issue was solved in the next update.
We already upgraded our site to Joomla 3, the administrator interface of Quiz Deluxe is much more intuitive in this version.
Thank you for the update!