We are using GitHub in our development team as our source control solution. GitHub allows us to easily work from either the office or remotely. Git's distributed version control makes branching incredibly easy, and GitHub provides the most seamless and easy to use Git solution I have found. GitHub provides a ton of integration options with any tool you are using.
Pros
GitHub makes it easy to research and find what code changed and when.
GitHub is easy to integrate with other tools.
GitHub is reliable and dependable. I've used it for nine years without issue.
Cons
When browsing history of a file, GitHub could make it easier to see the file after a particular commit instead of just being able to quickly view the commit. I'd like to be able to see the commit or the file itself in one click.
I would like to be able to view commits by user.
I would love to be able to traverse code on GitHub (go to definition, etc) - the good news here is that they are working on these features!
Likelihood to Recommend
Any scenario where source control is needed is a scenario where GitHub is well suited - that means, any time you are writing code and don't want to immediately throw it away once you are finished. GitHub is especially well-suited for remote work and any work where integration with third-party tools would prove helpful.