material-ui is good, but quite massive.

Most annoying thing with material-ui is that within a ~year it has gone from 1.0.0beta -> 4.x.x and each major version update has caused me quite a lot of refactoring because of whatever they've decided to overhaul. The components themselves have been pretty much the same all the time and they do work nicely but the styling / theming utils have been in flux.

Agreed. I am trying to do devcards to make sure I can update the version safely.