I like how easy it was to get started with this library, as well all of its features are very useful for me in my daily work life! Nothing at first glance but if you want more customization options then there might be some issues here or maybe not everything works perfectly fine (but i think they're working hard so no worries).
It really helped us making our website look better than ever before by using their awesome material design components which makes user experience much easier when we have multiple pages/components within one page/component.