What are /r/amazonunderground's favorite Products & Services?

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I may have found a partial answer for some folks.

I was having the install loop: Installed the underground apk, looked at the app settings to enable tracking for the free apps, got directed to a link to update the appstore and then either the apk wouldn't install, or it would, and I'd still have the same 'update appstore' whenever I tried to enter app settings.

For me - this was down to having a Samsung phone which came pre-loaded with some amazon apps, which seem to have been conflicting.

I downloaded this from the play store (free): https://play.google.com/store/apps/details?id=com.jumobile.manager.systemapp&hl=en

Then I used it to remove the amazon store system app and the amazon app store system app.

I then went back to my email link for the underground app store, installed it, went to app settings, it asked me to click to update the appstore, downloaded the next apk through Chrome, installed it, and BOOM, underground working properly.

You'll need to be rooted, but it worked for me straight away.