We have recently upgraded our server estate over the 8.3.6, we have always used EAM to push projects, resources etc from dev to prod and various front end servers. We upgraded from 8.1.34 and so far the experience of EAM in 8.3 is far worse than before. The main two issues we are having is that when we are creating a task and it is getting the list of projects from the source gateway (or destination gateway) it takes a good 60 seconds to load the list (project count is only 8), it's good to see that the projects are no longer duplicated for every server that is connected.
The second issue and probably most frustrating one, is that the resource list is no longer in alphabetical order, so when trying to send a folder you spend a long time searching the list for the path, and this almost makes it quite error prone.
Finally, if you go back into a task and edit it, all the selected resources are no longer selected, so you then have to go through the entire process again.