Nice Hunt!
Pros:
- obviously it being so cheap (compared to other services)
- easy to use and set up
- trackable emails
- just simply check your campaign overview to get an exact count on how many people opened your email, how many were marked as spam,...
Cons:
- with it providing the same or even a better service as others 100 times cheaper I couldn't think of any negative point to it
Thank you very much! :)