I just moved over from Ninja Forms and one thing that they had that we are dearly missing, is the ability to view all saved form entries in wp-admin in the same way you would view submissions.
We have become reliant on this feature. We have a very long form and it is an important process for our sales team to follow-up on potential clients who have saved their submissions but failed to complete the form. Without a way to easily see and track our clients through the process, we are losing out on sales.