I'll let those who skate comment on whether a back-up pair of skates would be acceptable at a big competition. Probably the most famous boot problem was at 2001 Worlds, where the heel fell off of Michelle Kwan's skate shortly before she had to take the ice (in the Q round). Her father reportedly nailed it back on (not sure how that worked) and she went out and skated a 7 triple program.Well at this point with the number of athletes that have had "boot issues" come up in relation to big competitions over several years, it seems like poor management/preparation that big-name, elite athletes don't have a back-up pair of skates with them especially in major events like Worlds, Olympics or Nationals that determines who goes to Europeans/4cc/Worlds/Olympics in case something happens to their primary pair.
And based on what Flying Feijoa detailed out - if I were an elite level skater and I currently wear Edea boots or if I were a coach with a skater wearing Edea boots, I would be looking for another brand since Edeas appear to be getting a track record of breaking at the worst times.