It’s easy for us as developers to use since it integrates with our other services such as Twilio or Sendgrid easily.
The support team was very responsive when we had questions about how best to implement certain features in order for them to work well together. We were able to get some of these issues resolved quickly which made me feel like they are invested in solving my problems rather than just being an intermediary who handles billing/payments between myself and another party that I am working with. This product has allowed us to continue using mailchimp while reducing costs associated with sending out newsletters through those platforms without having to spend time managing both accounts ourselves.