Last week, I migrated my community from using SES to using CiC for outbound email. So far, it's been a pretty smooth transition. The only thing I "miss" and wish would be available is email tracking.
There are times someone says we did not get an email from us and I will go pull the logs to show that the email was not only delivered, but also opened by them.
Overall though, this is one last thing I need to worry about going forward so I'm thrilled with the simplification.