Interesting that, as JosephH says, the Slyde can be used as a load-limiting device. Google search revealed this diagram from an accident report involving someone using the slyde in a load-limiting self-belay anchor setup:
Note that THE ACCIDENT resulted not from a problem with the Kong Slyde, but from the use of a toothed ascender device (Petzl Croll) to connect the lead climber/caver to the lead rope (obvious no-no). The climber was also leading on a static rope.
Despite the fact that the description comes from an accident report, it seems to be a clever rig for limiting forces on rope solo leads. Rope diameter and sheath "slipperiness" are obviously going to be very important variables in determining at what force the device slips. The Kong website doesn't have much in the way of technical info about the device.