Why is everyone complaining about double-shipping? Presumably, you are buying a comic because you enjoy it, so twice the number of a given enjoyable comic is a GOOD thing. Yes, yes I understand we all have budgets, but for me the 1 issue a month thing is too slow. I want to know what happens next sooner than that. Another great thing about double-shipping is, you can have rotating art teams - two superstars you cannot keep up with a monthly taking turns with their arcs.
This is a concept I have been yelling at Marvel to do for YEARS. It keeps stories inside the main series and discourages them from releasing the many useless mini-series they used to produce like crazy. I don't understand why many readers are so damn butthurt over this.