Not heard the same reports your are referring to. I have had excellent luck with Amazon apps working (just the opposite actually, apps that did not work from snap worked from AAS). It really is easy to install the app store app (you do it from the phone). Just use the browser to search "amazon app store" and a giant button appears for you to download the app and open an account from there.
Link:
Install Amazon Appstore
You can also make in app purchase if you have an amazon account. Would like for BlackBerry to strike a deal with Amazon to have this preloaded on the device. Only catch with AAS is selection, it's not as good as Google play. .... but the major ones are there.
CB10'n it via da Z...30