I used my ride flight boots size 11, on a Flow Large binding. They're a rather small boot footprint but the toe cap was just too small and would sit on the bottom of my boot. I had to adjust the top cap after locking..defeating the purpose of the rear entry. I did try using several different boots in the store and all had the same issue. I moved a size up in bindings (XL) and that did help but the width of the binding left way too much space between the boot and the binding sides.
They're really close IMO but the toe cap is going to be a big issue for them. If it was more like the GNU bindings it would work.