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Is Bootstrap 4 ready for use?

It's currently in beta. According to the developers there will be no more breaking changes, so that's something. It's also the default download version on getbootstrap.com now. For early adopters I think it's a good pick. If you need more stability, Bootstrap 3 will be maintained for some time as well.

Bootstrap 4 has some really good new features so I use it for my own projects.

That's not accurate on breaking changes, there will be additional ones in the future:

> We’ve done our best to prevent breaking changes, but we had to sneak some in. Regrettably, we’ll also have a few more coming in Beta 3, too. However, we’re clearly outlining all of them for you to make the upgrade and testing process as easy as possible.

Source: https://blog.getbootstrap.com/2017/10/19/bootstrap-4-beta-2/

Ah yes, you're correct.

What are those really good new features? How hard was it for you to transition from 3 to 4?

P.S. I'm really comfortable with B3 just not sure if I'm willing to invest the time and energy to learn 4 just yet.. Unless of course the new features are really that compelling :)

It changed a lot during the alpha phases but it's in beta now and I believe they said they would not make major changes to the api so I'm using it currently in new projects.

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