Pros:

• Great platform which simplifies and makes the designs of your applications easier just by using their already proven codes which are being used by some well-known companies or platforms like Bloomberg and Huffington Post.
• Very great user interface which is very friendly.
• Has lots of stylings to offers thanks to its many documentations found in its Github.
• To top it all, this platform is open source, meaning anyone who is a coder and has something to impart, he can contribute right away and wait for merging of his/her pull requests.

Cons:

• None for this amazing platform, such a great initiative.