The Deserts are excellent at gripping in the dirt and they are very durable in heat, sand, stones etc. They give about 6000km of wear when used mostly on tarmac.
I do not want to suggest not using them, I just want to warn people about the danger of using them on tarmac at higher speeds. The problem seem to be caused by the front tire more than the rear.
I have a client that came of his bike at about 130 to 140km/h on a straigt as an arrow Namibian road and ended up in hospital with broken ribs and collarbone, and a punctured lung.