I'm currently using v6 which originally started as gold under ver 4 and was upgraded since along with many book purchases. Right now I am not really looking to add additional resources. I can't really find anything that explains the difference between these concepts and why I should think they are useful:
- Feature set
- Starter Set
- Monthly rental
Of course there was an entirely different concept of cross grade going into v6.
It seems the real differences are very hard to discover. I see this description buried in a footnote for the Starter set "Get our full set of features, including Sermon Editor, Concordance Tool, Psalms Explorer, and more, only in with Bronze and up!" So it appears that a starter set added to what I now have is of no value.
It seems some features only appear in the monthly but don't really understand which ones. The "feature set" seems similar to the old crossgrade maybe? but even then not sure what is really added and nothing I have seen is very compelling so far.