I like the panel, it's really simple and clear, you can find whatever you want easily
The price! Exceedingly cost effective when paired with Amazon SES for the actual email sending.
Nothing to dislike really. Easy to set up and configure.
The support is poor. It seems like one guy called Ben provides all the support and he chooses which requests will be responded to and which will be blocked. He did not wish to answer my requests as a paid customer so that it why it is getting a poor review.