I really like the cross section on old razor blades. The hollow grind on a flat, rod, or occasionaly concave back edge is remarcably stiff, and slides throuh flesh like a soldering iron throuogh butter. At one point, I was homeless, and had only a straight razor with a round tip for a knife. With practice, I was able to get good enough to cut veggies, and meats with it like a small chef's knife.
On the other hand, I've played with the tipless folders, and found them pretty useless myself. They don't appear to do anything better than a tipped design, (Except for poen on you'r pant's leg, something I was never brave enough to try.) All the ones I've seen had flat sided wedge cross sections, which is less optimal, and I still managed to gouge myself on the corner.