I tried this out and quickly deleted it. After reading some of the reviews, I felt they were a bit too harsh, and I planned to write a positive review to offset them. This plugin is very basic and doesn't seem to be a priority for GetResponse. I eventually switched to Optin Cat's plugin, which is approximately 100 times better.
I did manage to get the API to connect and add a widget to my page, but it just dropped a totally inflexible iframe onto the page. There's no way adapt the width or height or padding of the form, either in the plugin or in GetResponse. So anyone looking for something mobile responsive won't get it here. The plugin doesn't even do some of the most basic things, like providing a link to the API page in GetResponse (it does give instructions for where to find it, though).
This plugin is really only useful for someone who wants a large, centered form on their page (such as below a blog post), and doesn't have a mobile responsive website. Otherwise, I think a basic link to open the form in a new tab would be better, and you don't need any plugin for that.
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