I think my blade which wraps packing foam looks a bit smoother and has less shadowing than the foam tube, but the foam tube is very much easier to install. There is room enough to add a couple meters of clear gift wrap which does a fantastic job of smoothing it out.
I recorded a video assembling a new blade, but I haven't had time to edit it since I'm in the middle of moving. I'll make another blade soon, so I may just re-shoot it after I've moved.