I can mirror the overall very positive feedback of this form builder, it has a learning curve when it comes to build sth complex (like a quoting form with configurable products), but compared to other solutions it has the capabilities to do so, very impressive! 5 Tacos for that.

4 Tacos at this stage about the deal:
I seriously miss custom CNAME and the Export to Excel feature, stuff like this should be part of an AppSumo deal. You want to grow ambassadors for your tool, so cutting out these essentials is not a good thing to do.
I have no issue with a subscription on the extensive stuff like integrated payments etc, or if you made this stackable to provide the higher tiers as LTD of course, but the 2 Essentials above I'd ask you to seriously consider to make part of the AppSumo Deal.
That would be 5+ Tacos then ;)