Hi after installing this plugin I was unable to login to my wp admin getting an error "cookies are blocked due to unexpected output" The only way to fix it is to rename the plugin folder in the wp directory. After that I could log back in.
I switched from MC to Aweber and had their email list subscribe form in all of my posts. This saved me from having to go in and change every single post by adding my a weber form easily.
Great little plugin does what it says. No kinks so far.