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I have actually just bought an ED72 and am waiting to see what the "Correct" flattener for it turns out to be. I have read that it is actually an ED80 flattener (And is even marked as such) with a male/male thread adapter to fit it to the female drawtube thread of the ED72 (The rest of them with that size drawtube are male threads)
The issue with them seems to be that in-focus travel is very limited. If it proves to actually be the ED80 flattener I am going to see if I can get an ED80 drawtube to screw the flattener directly on to it, saving a couple of millimeters more.
It seems on the ED72, 55mm is the smallest flattener to sensor distance you should look at, but then the in-focus travel is an issue again.
I can tell you that with no flattener, the curvature is very obvious. I did a rough first light without one last night.
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