Super easy to use, and yes, my conversions/opt-ins have definitely gone up with the one-click functionality. Unfortunately, I'm currently getting an error that Facebook is not currently working for opt-in/sign up, and there's no individual button code available for Amazon even though I have it turned on as one of my social sign-on options. Still using it like crazy though, and loving the integrations with Acumbamail and other AppSumo products.