generally, i never worried about having real sharp blades. this year, i've decided to carry sharp blades on the trucks, and replace them perhaps twice - three times a day. i'm finding that- you get an obviously nicer cut on the first lawn after putting the new blades on. but, by the 5th or 6th lawn, your blade isn't sharp anymore. our lawns are only 3-4,000 sq ft each. there is no way i'm gonna change blades after every 6th lawn. my conclusion is that- though having a razor sharp blade is beneficial, it just isn't practical. the only lawn that truly benefits, are the first maybe 4 lawns, after the blade change. opinions?