That's what I figured...the Res-C seems like it would be much better for impact. I don't have a DF but my S6 is a pleasure to hold. I can easily imagine using it all day for this kind of work.
Just from watching the videos, it didn't look like 'bite' was too much of a problem for the DF. Some of those blades definitely bit deeper but just count the strokes, that DF made short work of that 2x4. Great stuff.

Also, Justabuyer mentioned that the Ratweiler showed no edge damage after the test. Pretty impressive performance from SR-101.