We have a lot of integrations off Slack to keep track of how people use our service. We can monitor the communication between our stylists and our clients in real time and observe if there are any issues that require a human touch to resolve.
We don’t love the MailChimp interface, and we were sad to see Mandrill (which we liked using) merge their product given that they service fundamentally different needs. It’s clearly an attempt to get customers from one service to another without thinking of the needs of the customers that use the two different services. MailChimp’s pricing model isn't too great either.
We’ve had great experience with TriNet. There are several startups trying to disrupt the space, but we don’t have any complaints about TriNet and it’s proved to be an affordable option (based on the relationship we have with them).
Over the last year, we migrated everything from Heroku to AWS directly, and we use Convox to manage our deployments. Cost, control, and latency were why we switched. Heroku gets tricky and expensive long before you're really scaling horizontally, and we get much better performance from AWS directly.
We’ve tried Github, Trello, and JIRA, but none of them have been a great fit. They're too technically focused, and forcing business people to use a tool built for developers makes them use the tool less, and less effectively. As a result, we don’t get as good intelligence on the status and needs of our projects. We like Basecamp and will probably end up using it soon, especially as our team grows.