Recs.
Updated
Semantic is a development framework that helps create beautiful, responsive layouts using human-friendly HTML.
Specs
Pros
Pro The elements offer a huge amount of customization, far beyond a framework like bootstrap
Cons
Con Not for beginner developer/unfamiliar with Javascript
Many features in Semantic UI uses Javascript customization such as for Modal. This is unlike Bootstrap that can add Modal just with customizing the HTML attributes. Developers who plan to using Semantic UI must be familiar with Javascript or JQuery to get the most out of it.
Con Subpar JavaScript plugins
While the styling and components parts of Semantic UI are well-made and eye-catching, the logic and JavaScript part needs some work.
Many features are bugged or behave in unexpected ways. Some aren't optimized to work with all devices. For example, the navigational menu in the Semantic UI website is often laggy when viewed through a mobile device.
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Flagged Pros + Cons
Pro It'll have almost any UI component/element you may think of for your project
It includes tons of UI components that you may need for almost any type of project you may work on. And of course, you can always only pick what you need.