I have tried many email marketing tools and Inbox has one of the nicest UI in my opinion. It is user friendly, easy to navigate, and gives you all the information you need in a meaningful and organized way. No more clicking around endlessly to find out a certain piece of data. I also love the real time activity feed with time stamps which is not present in many other email tools. I just wish there were more integrations in the pipeline besides zapier. Other than that, it is a great tool and I recommend it!