At the moment, the Amazon Mac Downloads Store isn’t nearly as impressive as the Mac App Store, but Amazon has a great deal of retailing experience and has shown the patience necessary to build up a market. In a year or so, the Mac Downloads Store could be a credible way to find and purchase a wide variety of Mac software.
As a user, I like that it’s fully accessible from a Web browser. I can open tabs, copy and paste, find within the page, etc. Similarly, it’s much more pleasant to shop for Kindle books and Amazon Instant Video than to use Apple’s restrictive iBooks and iTunes Store interfaces.