Bugs3x :
How well do Striders blades bend? Will they bend to 90 degrees multiple times and return to straight?
They will not even come close to doing it once. When I snapped the WB I don't think it went much past 25 +/- 5 degrees. I did not feel much give before it snapped. While steel choice is important, geometry is very critical, you can't just generalize based on steel. In regards to the WB (and most Strider blades, PAB is the same for example), there is little or no taper to the blade and sharp grind transitions, this is pretty much exactly the opposite of what you want to allow a high degree of flex.
Anyway in regards to the steel, no ATS-34 is not flexible (in geometries common for heavy work blades). This has been described on the forums a few times. Drew wilson broke a couple of his ATS-34 blades and reported the results on the forums a couple of years ago. They were a bit softer than most (59 RC), but still snapped at a low flex, ~25 degrees. Lynn Griffith also did similar with one of his ATS-34 bowies.
By the way, most mastersmith blades don't return to true after they hit 90 degrees, however they can take a very large flex and return due to the taper, smooth grind transitions, differential temper and inherent properties of the steel. Fully hardened CPM-3V can do similar according to some tests that Ed Schott performed. Busse Combats INFI can also take a large bend.
It would be pretty hard to persuade me that stock removal SS blades are in the same league as the carbon steels forged by the Master Smiths.
Stainless steels are not in the same class as carbon (1084) , spring (5160) and shock steels (S7) in regards to ductility and impact toughness, no matter who does the heat treat. However high carbon, high alloy stainless steels are inherently very strong and compression resistant.
On a blade crafted from such, the high hardness and strength will make the edge very durable in light to medium work as it will resist compression and deformation to a much greater extent than a softer lower alloy steel (5160 at 58-58 RC say). However once the level of impacts starts to rise, the durability of the stainless blade will take a rapid dive as it starts to fracture whereas the lower alloy steel will just continue to deform/indent.
In regards to strength, Striders blades are among the top (of a given size knife), due to the shallow sabre grinds and very hard, high carbon, high alloy stainless steel. They are also one of the few production companies with a full warrenty on their blades, so you really are at no risk in trying one out.
-Cliff