Since this is a UX site, here's my impression:

I found the landing page a little confusing.

"Edit my Free Checklist"

I don't have a checklist to edit, I think this should say Create a Free Checklist?

Also once I clicked that, and it took me to /accounts/new, I just clicked Checklist in the top bar to view the checklist, which is what I originally wanted to see.

It'd be cool if when you clicked something on /welcome/checklist, it did a 'gradual' sign-up and say something like: "Do you want to save this?".