I haven't had mine on pavement yet, but others on this forum have said that they wear pretty well.
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I have been using the Desser 21/800-6 tires for 230 hours now; about half that time on pavement, the other half on grass. I can hardly see any wear at this point, they still look like new. I keep hoping they will wear out so I can justify getting the smoothies.
I have almost 400 hours on mine, I'm based on a paved airport. No noticeable wear.
The "Bushwheel" style tires wear quickly on pavement, but the Dessers are much less prone to this.
Mine have been holding up nicely on pavement.