The download and install was a breeze, the help section is very straight forward and easy to understand, the user friendliness is pretty good (although some improvement is needed), and you can customize it to fit your needs. Very important!
The support is excellent! I did have one issue with the send button but it was my fault. I contacted their support team and they responded immediately and were very friendly and helpful as they helped me resolve the issue.
It's a great extension!