Works as promised, outstanding support

I tried this plug-in as I needed a simple double opt-in form and was already using wpcf7 for other forms.
Configuration was easy and the plug-in packs everything I needed and more.

It did not work at first, so I contacted the customer support and did not expect much.
To my surprise, they replied within hours, checked my configuration, confirmed everything was right, took a backup of my website to investigate the issue and then sent me a fix (which had to do with a change in wpcf7’s checkbox validation through an update). All of that within a day.
This is customer support at its best! The amount of effort that went into fixing my problem and the fast replies were exceptional. Thank you Marc Wagner and Forge12!