We just moved to AC, so we will see how it works out. So far, fairly good in terms of the platform not being buggy, the editor working pretty well, and the folks that work there have been nice. Only thing is after moving our sender reputation immediately dropped and our emails stopped getting as many opens. . . so not entirely sure what to do there. Tried to talk to support about it but it seems they think it's outside of their control? We moved from Mailchimp where we could never get in touch with support whatsoever so this is an upgrade.
