Rhoadsie:
I started out thinking just this way, get one, then a couple more just so that I have a spare or two, then I need to find out what other grinds-sizes-steels I might like, well you get the picture.

Seven day sets are so that you can shave with a different razor that's the same every day of the week, but then there are 52 weeks in a year and I can't find that many seven day sets so I have decided that one razor a week (on average) is about right.

And I originally thought I would save money buy not purchasing throw away cartridges.