I thought I'd share my experiences with A+ Content now that it's been opened to everyone. The nice thing is, it puts us indies on a more even footing with the trads by giving us the ability to fill the "From the Publisher" section on a book page and have our stuff use up the most real estate rather than ads for other stuff. After a day and a half of work, all of my books now have a standardized "From the Publisher" with the top half particular to the series they belong to and the bottom half particular to the universe (all of my series are in the same universe and with this change, I decided to brand said universe, tying all the separate series together.)
But, it being Amazon, it's somewhat clunky. At its core, the A+ Content construct is very much like a low rent website builder, which means you're limited to certain modules and layouts, and only a limited number of those. You also have to create your content for each market - it's not do once, use many times - but after futzing around a bit, I finally figured out how to copy from .com to other stores. One hiccup for me, I'm using A+ Content to market my other series and put links to the series pages rather than individual books, but few markets beyond .com have series pages, so that strategy will not work on, for example, .ca. Time will tell whether using the A+ Content real estate to market my universe of five series brings me more sales.
If you want to see what it looks like, hit me up on .com