They usually use the sketchy repo for their public releases due to the legal grey area--I asked them about it because it seemed like such a bad way to promote their app. Seems like a bad decision to me, but that's why the non-beta releases are generally not on their own repo.
Personally, I won't use the sketchy one, especially since they make the Pandora tweak depend on their own repo packages (so to download the Pandora tweak you're forced to install other packages from the repo). When the earlier version was only available there I ended up downloading it but then rebuilding the .deb with the repo dependencies stripped out so I could load the app myself. Then I just uninstalled the other one, and deleted the repo, and reinstalled my own, clean, version. If need be I'll do it again.