Salamander,
Busse's handles will NOT slip off, peel off, twist off, burn off, fall off, wear off, or freeze off. Resiprene C is a new material for handles which SPANKS Kraton and just about every other synthetic in the "rubber" knife handle category.
The handle slabs do touch the Kydex, but the knife is retained by the print of the kydex on the blade and front talon. You will NOT wear or deform the handle.
As far as your dilemma about which knife to buy, a Basic #5 will out-cut, out-chop, and out-wear anything in its class.
Andy