This platform has been a bit controversial since the beginning but I stuck around. The service is pretty simple, you'll get a template with fields that cannot be removed but if you use all of the fields the signature is fine. You wont be getting an HTML signature, but a .PNG that can embed a hyperlink, which is probably ok for most people.
I tried creating a new signature and a message displaying that I need to delete a current signature in order to create another one popped up. I have 10 signatures created by the way, and yes, my plan is still showing "Pro" in the profile. The service was sold as "Unlimited" signatures. Come on, this is so frustrating, and not sure why Appsumo won't step in and hold these founders accountable for these bait and switch companies. I reached out to emailee support a few times and no response, and the chat widget on their page is uselesss. I was just reading a Question and section and I saw that the founder confirmed that the signatures are reduced to 10 signatures for Appsumo users. This is a horrible practice and what is turning people away from marketplaces that promise and don't deliver even the simpler software services.