I've had 2 new avons split on me in the past, and I detest Bridgestone tyres.. I failed loads of Mazda cars on their first Mot's for deep cracks in their tyres showing cords.. Chinese tourances came off, german ones went on. An experiment in the interests of science and Internet folklore.. if I think in any way they are going to be under par, they're coming off.
As an aside, I've ran Tourances for years, I had a 700 mile run up to the top of Scotland and back last year, and the Highland roads ripped the tyres to shreds.. the rear was really squared off after that run.. had German Tourances on my Aprilia Pegaso and they did 2000 miles to Berlin and back and were hardly squared at all... more curves in Scotland than the Autobahn..