I broke one of your rules. I have been running Moodle 1.6 beta 5 on my production site. I just gave final exams to 138 High School Seniors. We use a lab and aprox 30 students take the test during each period. I am happy to report that everything worked perfectly. The new features in the quiz module works great. I had no problems at all. I also import my questions from examview. the import functions worked fine. I tested 1.6 for two weeks before I put it in production, so I didn't go into it completely blind. I had one question that the answer was wrong, so I had to fix the answer and use regrade, it performed exactly as it was suppose to .