Could you please clarify if this is only for a theme layout OR if it allows for theme region layout plus managing fields in a content type as well as panels pages layouts or even mini-panels?

I'm assuming all of the above if it piggybacks on Panels, but just wondering how the breakpoints work when one is laying-out a content's fields or a panel page when it's within just the content region of the main theme layout. How do the Breakpoints widths trickle down? I'm also not sure about where the region layout comes into play and where that leaves theme selection.

Thanks for your time. I'm almost done with a large site that uses AdaptiveTheme responsive AT Layouts which are great albeit not customizable, so a bit limiting. I'm looking forward to checking this out on the next project in the next few weeks!