When you're addicted to cake decorating like I am, all magazines and books has something to offer.
MBN has beginner cakes to professional; not as sophisticated as ACD.
ACD is "geered" more for the intermediate baker. Pics and articles are much better!!
I get them both, but, again I am an addict!!!!! 
I have ACD but am planning to get MBN at some point. In fact I was just at the cake store yesterday but they had already sold out! I like ACD a little better because it's more professional -- in techniques presented and overall appearance of the magazine. Mailbox News, however, has some very creative ideas put forth by mostly beginner cake designers. But if you have a cake you've done a couple of times and have perfected the technique on, take a few pix and send it in!! Some very big names in the cake world have started out that way!
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