I really wish that more people really understood that and took the time to change their blades. Just buy all of them at the same time and swap as needed....Different materials require different blades.
As an aside, too many years ago when I was talking to Christian about having a FOG get together I came up with skill building contests and one of those was the timed blade change. Unfortunately things didn't work out, but that and the Sys-Roll Slalom would have been interesting.
Peter