I've been running this for a few years now, but for personal email I've found I rarely read it on a computer. Once in a blue moon I have to open SoGo to click a link or grab a code from an email if my phone isn't handy, but that's it.
It works fine, it's quite simple, the "material design" look is perhaps a little dated now but nothing like Roundcube.
I am using Roundcube with a modern theme called Elastic. It works like a desktop app. I have gmail through work too but I don't like using it. I think Roundcube is much better. But my colleagues prefer Afterlogic which has a much simpler interface.
I just upgraded my whole mailserver recently and the Elastic theme is growing on me. I had the usual gripes about everything moving around for no reason but the theme seems a lot nicer for modern displays and (my) aging eyeballs.
It works fine, it's quite simple, the "material design" look is perhaps a little dated now but nothing like Roundcube.