Yep, I know the guy - Jon Ohana. Great guy, nice sliders but yeah, definitely for a light-duty application. Frank's SliderZ are beefier and probably a better long-term investment.
I've bought 2 sets of Ohana Fab sliders and have been very pleased with them. Fittment was damn-near perfect. But they won't stand up to a hard, heavy smack on a rock - but they'd spread the impact across your pinch seam saving your rocker from an ugly cave-in.