Gary,
I have been using the double edge safety razor for a few years now. Before that many years of the 5 blade. For quick, smooth and minimum nicks I would have to say the 5 blade is better.
I am not need or especially want a super smooth, baby bottom smooth shave. It grows out in a few hours anyway so why put all the effort and nicks into a super smooth shave?
I also use the DE safety razor for nostalgia reasons. Maybe a little anti-technology thrown in as well? (I am an engineer too, working at a large aero-space company so I am not anti-technology per se.) I am hoping that once I choose a brand of blade that I can purchase in a large quantity to reduce the price per blade.
I bought a sample pack of blades that includes Gillette 7 O'Clock, Wilkinson Sword, Feather, Shark, Astra and no-names from Israel.
The Feathers are very sharp and provide an aggressive shave. Too aggressive for me. Frequent nicks.
The Sharks are also very sharp but a bit less aggressive. They work ok for me. Some nicks.
The no-names from Israel work well for me, sharp but not too aggressive. In fact all the others seem to give a fine shave. They all seem to give me 7 shaves, getting noticeably duller by the end but still providing a reasonably close and nick free shave.
As far as the blade-flipping-over-each-shave technique, my dad is an Aeronautical Engineer...might explain it. A funny story he tells about when he was packing to report to the Army near the end of WWII. He went to the local pharmacy and purchased a box of 100 razor blades. He doesn't know what he was thinking. The sales lady jokingly asked if he was going to Antarctica for a few years.
Craig T.