The Pros:

• Having been used by many developers and websites/companies, this product just proves it has that Wow factor that is effective and quality-wise, a good product to use.
• This makes coding a lot simpler.
• Streamlining the codes provides better developments especially when doing bug hunts and improvements on the codes.
• Open Source means you'll be able to use it for no fees at all and is free of copyright infringements.
• Open Source means improvements over this product can be taken over by anyone in case the developers discontinue Styled Components.

The Cons:

• Support may be limited for open source products in the future if the original developers lets go of it and no one or a non-competitive team succeeds the project handling.