im using it for now. In my case, it suits my project.
I like the way it is abstracted - very similar to a custom system I was using before. The way you just swap out input “maps” makes sense to me.
As with a lot of epic stuff though, if I run into issues getting it to work, and I dont know enough to understand the source code (or just dont want to put in the time to reverse engineer), I often take the basic idea of it and then make my own version using blueprints.
I haven’t had to do that with EI but I did that way CommonUI.