Recently I bought a set of Calli wide whitewall tires. I could find nobody who had used them and I said I'd report back once I got them.
They are mounted, not being driven on yet. But, I can give a preliminary report. I suspect it will take months or maybe years to tell more.
The other similar tire is Diamondback. They both take a production tire, rough up the side and apply a whitewall to it. Both say they vulcanize it, not sure what the difference is between glue and vulcanize, but stuck pretty good.
Diamondback has a better finish. Calli is cheaper.
Calli will tell you they occasionally have a defect in the white, sometimes a small bubble. Mine had none. The edge of the white on the calli tire is not finished, it's just a white, square edge. Has a cheap look to it, looks a lot like the old port-a-walls, I think they called them, the ones you put on a blackwall tire that went in with the bead and laid against the tire. It also has the wire brush or grinder marks where they roughed up the tire showing about 1/2" to 1" past the white.
Diamondback is very similar, it just has a black finshed edge on the white and no grinder marks. Diamondbacks cost about $50 more per tire, so it's a tradeoff. More than 10 feet away, you might not even see it. Driving down the street, I know you wouldn't. It was hard to get good pictures, but you can get an idea. Top is the Diamondback, bottom is the Calli.