I've seen the Rat Pack and it looks really interesting. Might even consider replacing the "man-purse" I carry around with one some day. With the FAK, I've found that I like being able to zip it open and lay it out like an open book and have everything as immediately visible as possible. Most of the stuff in an FAK is flat and labeled on the broad side, so it would seem the "book" format work best. The boxed kit I'm replacing had most everything in poly ziploc bags, stacked such that I could rifle through it like a file cabinet. This worked pretty well also.
I had one the older OR organizers, sorry to hear they've changed the quality/design. It was a pretty tough and handy bag.