I purchased them three years ago for my 26" wheeled sport/tour bike that has regular Reynolds 531 road blades like you'd see on any road bike 20-30yrs ago. I installed them with a Tubus Tara low rider rack and rode it occasionally with a full grocery load of about 25lbs. for about a year. I wrapped the tubes with some black electrical tape and the supplied protective strips. When I removed them the fork blades were fine.

They work fine. If you have round fork blades I'd use the hose clamp method.

btw my preference for the Tara is with 700c wheels, with 26" the panniers are kinda low to the ground and it felt like there was almost a ground effect wind resistance when going fast down hills as the loaded panneris weren't far from the ground. This is really nit picking though as it's speed uphills that matters for time over distance and any loaded bike will be going slow uphill.