I made it to final 72 interviewees as well, and found the day really good!
While it probably was quite hard to shine in the big group exercise, there were around 6 or 8 assessors per group of 12 to keep an eye on us. It is fairly obvious when watching a group like this to see who's got the spark they were looking for.
I thought the panel was a very good test. It clearly shows them how you interact in a small group setting (such as on an a320), and at the same time tests your aviation knowledge. Without a broad knowledge of the industry, you'd struggle to form any arguments.
Best of luck to everyone who got through (as long as you leave a place for me!), and hopefully not too long to wait!