So I was laughing a bit earlier when implementing the User Registration Add-on into my site... it seemed like the perfect way to use GF and expand the User profile.
Then I read what the limitation of the Add-on is:
Limitations
The User Registration Add-on v1.0 does not automatically add custom meta fields to the WordPress user profile page.
Isn't that the whole point of an Add-on like this? Why else would you use something other than then default registration of "usename" and "email"?
What that being said... is there another way to expand the user profile with extra meta boxes?