I tried it a few years ago. I was really impressed by how lightweight and gorgeous it is. In particular, I found it really cool and actually useful that you got a live view of your other workspaces on your panel. You could even fullscreen a video on your other workspace and then watch (a very small version of) it in your panel.

But yeah, even though I came back to it multiple times, I never ended up sticking around. It would crash regularly (not the worst thing, since recovery was generally seamless, but still meh), but in particular, it had some peculiar design decisions.

For example, if you double-click a window titlebar in virtually any window manager, it will maximize. In Enlightenment, I believe it got shaded (i.e. the contents of the window got hidden and only the titlebar was still visible).

Another prominent one was that its applet for connecting to WiFi and such didn't support NetworkManager, but rather only ConnMan. If you've never heard of ConnMan, yeah, I only know it from Enlightenment, too. Similarly, my distro (openSUSE) didn't package it either (and openSUSE was said to offer a relatively good Enlightenment experience). That's something which should just work, because you can't expect people to look up how they can connect to WiFi while they can't reach the internet.

And yeah, these are just the big ones that stuck in my head. There were lots of smaller usability issues, too. Many things you could fix by changing the configuration, but we're talking many in an absolute sense, too, i.e. you might spend an hour or more just tweaking things so that they behaved like you might expect.