After several days of testing. I think Stunning could be great, but it's not for today.
1 - Communication is a nightmare. On the AppSumo page, you see a ✔️ where it says Widget Premium! Well, don't take any notice, because for Tier 2, you'll be limited to 1 widget per site! it's not mentioned anywhere. I mentioned it in the questions, but the stunning team didn't make the change.
2 - You thought you had lots of premium widgets, but in the end you've only got one? No! not even! because for about 1 week, there have been no more Premium widgets with the pretty ‘No section found’ message.
3 - Some bugs have been reported but haven't been corrected. These are display bugs, and it's a shame it's taking so long to fix these little things.
4 - There is a possibility of exporting the sites created, but I haven't found it.
Conclusion: It's a shame, stunning could be great if it wasn't spoiled by communication that isn't at all clear and by bugs that don't seem to bother.