Thanks for the summary - and I read a review on this from another site where the writer detailed what she did. Your summary covered it all. Yes, it's three days minimum; the regular FPs have the normal restrictions (all one park / tier levels apply) but the other three can be any park / any tier.
What I couldn't find is how to get another FP in the park. Do we just have to use up the "regular 3" first, or all 6? To be honest, if we work this right, 6 FPs is probably all we'll need anyway (we're with 4 little ones so we won't be doing any open to close park days.)
It sounds like this will work for us - we already paid for EMM but we're considering cancelling that (yes, I believe you can get a refund despite confusion regarding that) since this will likely get us that which we'd do anyway via FP and it's cheaper (no brunch though).