What do you like best?
Mandrill as a platform has all the features I require of a transactional email service. My company has used Mandrill extensively for many promotions for several years now. It does the job well, until it doesn't.
What do you dislike?
Customer Service. In my experience Mandrill only provides Tier 1 customer service, with no option to escalate to an engineering team if there is an issue that can't be resolved by CS. The CS reps in my experience only provide canned responses with links to their support pages, and claim they have no insights into the inner-workings of their platform.
Recently, we were running a promotion for a Fortune 500 company, and our Mandrill capabilities just ceased to operate. The CS rep was able to assist us to get emails moving temporarily, but after we were able to move about 500 emails in a batch, the system ceased to operate. No matter how many times we pleaded to have a conversation with an engineer that could help us test, to determine where the issue lies, our requests were ignored (not even directly denied). We were forced to move our promotion off of Mandrill.
Recommendations to others considering the product
If you are looking for any type of automated transactional email provider, look elsewhere. Mandrill will not help you if you encounter an issue, unless you are in their top tier of users by volume. We have had two incidents which required CS support, and were never resolved. Mandrill fully admitted they would not even investigate our one issue, and encouraged us to look elsewhere. It wasn't a matter of whether they could fix the problem or not, we just wanted to highlight the issue, and see if there were any possible workarounds. They did not want to have this conversation so they ended the support ticket.
What business problems are you solving with the product? What benefits have you realized?
Transactional Email, sending and receiving emails to and from consumers to support CPG promotions.