The fact that I do not have to manually take care of follow ups + number of times a person opens your email is a strong indicator of their interest. This was a new feature that I saw, which really helped me in better understanding the number of times etc. that I should follow up with a person. Review collected by and hosted on G2.com.

Not very good on a Windows platform, and I have sometimes faced issues in beginning a send out. It is also a bit difficult to use, and I had to really play around to get a hang of it. Once I did however, it was incredibly useful.

One more thing, its good to pay attention to settings as they are very important for the campaign. Review collected by and hosted on G2.com.