I went to WDW last April, DL last September, then WDW in March of this year, then DL in August. I looked at the premier pass. I typically get a regular AP at WDW and a Deluxe AP at DL (the one with blackout dates, which I don't travel during). It came out to save about $50 for the premier. However, I decided against it because of the expiration. If I would have got the premier in April 2012, it would not have covered my DL trip in August of this year. So I bought a WDW AP in April, then a DL AP in September. So all 4 trips will be covered.