@mailok__twitter it depends on the situation everytime you will have a serious or non-serious project. Using Bootstrap 3.3.7 version is stable, though Bootstrap Alpha are mixed of stable codes, which it has new features than the version 3. So I think, instead of that question, you should see how big the project is to handle multiple modules using this front-end framework… Again, it depends on your needs. Bootstrap have multiple sister sites that support other modules, just Google it and you will see and amaze by it. Happy Coding!