We are currently looking to use the following plugin so that users can manage and edit their profiles from the front-end:
http://www.cozmoslabs.com/wordpress-profile-builder/
From what I can see, this plugin negates the form User Registration form feature of Gravity as it has its own.
We want to use Gravity's User Add-on because it ties in with the Paypal Add-on.
So, the question is, and I have already asked this and got no answer, can we use Profile Builder in conjunction with Gravity's User Add-on?