I don’t use any of the extras and am not interested (we have alternatives that we are happy with). We only use Lectora Publisher, but are waiting for bug fixes in order to use v17.
I agree with Darrel – fix the bugs, update the core product to the level of Storyline 3, add new features (not add-on products). I just saw the press release for the Yet Analytics partnership. Great, but not helpful for someone just trying to use the core product.