I did 6 and may do 7, although the need for an extra day away from home is an issue.
6 was chaotic with little running exactly as planned. It was also huge fun, and as long as you only take the schedule as a vague guide to what may or may happen then you should enjoy yourself. Of course, if you are coming from North America and ponying up for a long haul flight as well you may have a different view on whether the schedule should be stuck to .....
Deals We Like posted last night that everyone who goes gets Star Gold, presumably with Aegean. I can't see any other reference to this though:
'For starters, you’ll receive Star Alliance Gold Status and the opportunity to win hundreds of thousands of points and 5 years of Aegean Gold status.'