Not personally but we use them on the fronts of our 1/2 ton pickups that have snowplows. I haven't asked how the trucks ride without the blades.
My guess is the ride will be firmer all the time vs airbags which can be run at lower pressure or no pressure when not needed?
On the rear axle though, I'm not sure if the stock bumpstops touch the axle or not when the truck is not loaded. I suppose if the stops dont touch when truck is empty, and they have freeplay before the axle hits them, that the ride over small bumps would stay the same. Of course, if that were true, then you'd have a little more sack in suspension when loaded vs if the blocks were already in contact with axle from the start?