Bootstrap 4 almost beta?

We're using the BS4 alpha 6 for backend admin production systems (I'm coding in it right now) - and - I love it. The way to construct things is so much easier and consistent, it is very handy.

The only issues we've had was the modal popup issue where it errors out and stops working (due to an incorrect sequence of events firing off, we think) - we've worked around this issue by better controls over the modals (and restrictions on when/how to implement them).

I've even got a client who's using this for their upcoming production cart/checkout process (and they're testing the living daylights out of it, so far, works flawlessly for us across all browsers/mobile devices)