I shouldn't say, it's not cool. I think all EFOs are cool including yours. Just not sellable at a cool price.
I haven't seen one with an oval break. What I really meant was that EFO collectors looking for misregistrations are often looking for dramatic changes in design. With a lot of modern stamps there are minor errors that show up all the time, probably because of the sheer number these things were printed in.
Beyond invert errors typically imperfs and total color omits are the most sought after. Then probably misregistrations for modern with major shifts.
I bought this one a bit ago. I think it's similar to the one I linked above.