Are the more expensive 'CarbonMax' or premium blades actually worth it?

r/Tools discussion is mixed. Some users report Fiskars CarbonMax blades hold an edge noticeably longer than standard carbon-steel utility blades; others say the price premium isn't justified versus buying cheap SK5 blades in bulk. The honest read is that premium blades make sense if you cut abrasive materials (drywall, shingles, carpet) and want to change blades less often.