What truth ? It's a dangerous contraption.

Have you tested it for 6 months ? 25,000+ miles ?
How does the delrin wear evenly considering most driving is done in a straight line ?
When the delrin has a groove worn in it from driving in a straight line, how will it handle ?
After complaining that the frame tolerances from Nissan are so bad, how can this fit into all Xterras without being too tight or too loose ?
How does the delrin hold up to dirt and rocks trapped between it and the frame scratching the surface ?
Why isn't there a wiper on either side to prevent contamination ?
What about ice freezing it solid in the winter ?
What about a chunk of ice building up around it causing your steering to lock ?
What about a rock falling into the countersunk holes, jamming against the frame ?