Res-C is hard to describe. I have many Krayton handles on old knives.
Res-C is a Much, Much better handle material. It is much sturdier. Much more comfortable on the hands in extended use. It provides great grip, even when wet, without tearing the hands up as much in use as Krayton or other soft handle materials I have used.
It does not twist or roll about on the tang either. With many of my Krayton handled knives, I can feel the Krayton squishing and shifting about. It peels from the tang much easier, and over time, this gets worse, especially in hot weather.
Res-C is much firmer in the hand, and feels more secure at the same time. It is great for isolating the hand from chopping shock as well.
When the Busse (or scrapyard, or swamprat) site says that the Res-C does not absorb moisture or oils or fluid, they are getting to the heart of it. Krayton feels like it picks up oil from your hands, and then can get slippery at odd times (like when the temp increases), then you wipe it off, and it is "too sticky" until you sweat some more and then it gets slippery again. It is odd.
With Res-C, even when my hands are wet, or sweaty, it still feels fine (at least to my hands).
I cannot, for the life of me, understand why it is not a universal handle material in the knife industry. (it must be more expensive to use, or process or something that prohibits less makers from using it).
The ONLY thing I would change about my B11 handle is to rehandle it with the newer version of the basic handle (the one that is minus the finger grooves) It does not need the finger grooves, because the material provides a good enough grip without them. They would be fine on a 3 inch blade, but for swinging hard, they aren't really necessary, and give a bit too much traction to either side of the handle.
This is not an issue on the newer handles, as they are made without the finger grooves on the sides of the handles (or traction patches I guess you could call them) , and also have a slightly increased circumference (which for me is all bonus).