I like that it's easy for me as an admin of my clients account just to get into their inboxes without having them log in or anything! It feels more secure than using gmail with pop-up windows all over the place lol but i do love how simple this program makes managing multiple companies emails so much easier!! Nothing really at first glance though maybe if you're not familiar yet - be prepared because when you go through training they teach you pretty quickly what everything does haha.
Just knowing where each mail goes helps organize things quicker now (which saves time). Also being able to use your phone number instead of username/passwords gives peace of mind sometimes since we can't always remember stuff easily anymore.