Has anyone tried EY's multiflyer offer? It would be good to know what fare classes they're booked in and how good they are?

Edit:
- Just checked it's in D for business.
- Though the website does not state it, it must be ticketed by end of September 2012 and all travel must be completed by 31 December 2012.

I'm curious to know if someone had segments for last year (ticketed prior to Oct 2011) and was able to change flights to this year (ie beyond the original use by date of 31 Dec 2011)?