The reason I still use Inbox on Android, even when GMail has most of the same features is its interface design. I much prefer Inbox's approach where the emphesis is on the email subject instead of GMail's emphesis on sender. 90% of my emails are with the same 2-3 colleauges. They represent different threads for different projects and tasks. Gmail interface makes finding the right email cumbersome. I will continue using Inbox until it stops working.