I have had these on my CBR1100XX for a about six months now and can say nothing bad about them, in fact I am highly recommending them. They were great in rainy season and I went for a rip the other day in better conditions through the twisties and had less than 1/2" (10-12mm for you metric guys) unblemished rubber on the edges with fantastic grip and feel through the turns. Good wear so far, not getting flat in the middle even though more of the mileage has been on straighter roads with an admittedly very heavy throttle hand. These are supposed to be a multi-compound rubber with higher wear in the middle graduating to stickier compounds on the sides. Just thought i would pass on my thoughts, good riding all!