Frankly, tyres that seem to last a lifetime isn't good tyre. It may save you a couple more months or years before you change, but this simply means the wear rate is extremely low, therefor the grip isn't good. My friend use to have a set of Sime Tyres Monza HR7 which after 2 years still look like its new. The grip was extremely awful and you get tyre lock ups almost as though you were using F1 brakes. The tyres were finally changed after the car was involved in an accident whereby my friend failed to brake in time and smashed into a car in front.