Welp, two showstoppers for me over the native iOS mail. First, it looks like to check my mail I need to toggle between all my accounts. There is no unified inbox. Second, Priority Inbox is not supported beyond having a separate folder for "Important and Unread." On GMail proper, priority items go to the top and are marked accordingly, the Inbox unread count is the priority unread count, and hence I tend to leave non-priority items unread to get to inbox zero. So, iOS experience if you are a priority inbox user is completely broken unless I am missing something.