I've been single blade shaving for about six weeks now.

I've tried all sorts of things, and I've discovered that:

• I can't shave against the grain, no matter what I do
• Feather razor blades are much, much better than anything else
• The Merkur HD is a good razor, but can't shave under the nose
• The Feather "Popular" is a bad razor
• The Weishi is OK if you want to do lots of passes
• Shaving across the grain works well with a DE
• I'm unlikely to ever get a "baby bottom smooth" shave

I'm still experimenting, including with some other brands of razor blades, and going back to my cartridge razors for a comparison.