What is the advantage of upgrading from Premium to Economy or Professional?

I'm not clear on upgrades. Do the forms get more features? Does the domain change to something else? Is there any advertising involved?

Hi,

The only difference in packages are the submission and storage limits.  Every feature is available to all users of all levels.  We do not advertise or share your data in any way no matter what level plan you have.

The only reason to upgrade to the higher level packages is if you require lots of submissions or have large file attachments along with your submissions.