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I wouldn't call it fracture prone, and FRN in general is pretty durable stuff, but there is no practical way of adjusting the clip tension. Unless you carry a pretty fair stack of bills, it may not clip tightly enough to hold them together. If you carry any credit cards foled in with the bills, the reinforcing ribs by the pivot may warp the plastic over time.
This is a little off topic but I have a first gen. Endura and I've always wondered why they have that reinforcing rib at the pivot and successive models did away with it?
You believe rightI'm fine with my hard used zytel model, but the SS one would hold money better I believe.
I wish I could tell you, but I don't have a clue. The only thing I can think of is the rib may have been needed to get the nylon to flow into the clip portion of the mold. Once the molded clip was gone, the rib was no longer needed. That is pure speculation on my part.