[kayman]

I've been using bootstrap 4 in a current project and it is actually pretty good.

Cards are way cooler than panels but don't go overboard as some bootstrap-cards themes have done where everything is a card.

[robotvert]

same here, using it for internal projects where supporting old browsers is not issue, works good enough. on a different project I used one of the bootswatch themes and last I checked those were 3.x though so still hanging there.

[kcreb]

Bootstrap 4 is still in alpha though.