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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.

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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 :)

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