Groove Flow is the best automation tool that our company has used - it is intuitive with a friendly UI and strong integration with SalesForce.
It is very intuitive, and there is great customer support. I love using Groove to maximize my productivity.
Due to its great integration with Gmail, we had a better understanding of the communication frequency we had with our clients. The email templates were also very beneficial.
It's kinda bullshit how you can't skip people on your dial list and move them onto the next step.
The only complaint I would have is when I have it turned on in my gmail it covers up a portion of my email window where attachement typically show up.
If you have a large team (80+ users) using it, I think there are some other programs that are more scalable. User management was sometimes confusing.