I have, and every time I do, I basically end up trying to rebuild Bootstrap's grid. It has 4 screen sizes that cascade so you can set a small size and not expli

I have, and every time I do, I basically end up trying to rebuild Bootstrap's grid. It has 4 screen sizes that cascade so you can set a small size and not explicitly declare that you want larger screens to be the same, responsive and adaptive resizing, offset columns, push/pull (this is hard, and necessary if you need to change the order of elements based on size), and BS4's alpha adds opt-in flexbox. Regarding push/pull, Bootstrap is the only grid system I've used that has had this. The use case is when you want [x] [y] [z] on desktop to be [z] [y] [x] on mobile.