I bought a pair of these for the front of my car and drove them approximately 14 miles home today. I have measured the tread depths and found them to be approximately 6.5 mm. The Continental Premium Contact 5 which were removed had done about 28000 miles and had worn down to approximately 3 to 4 mm. These tires were original equipment on the car and I am pretty sure the tread depths were of the order of 8 mm when they were new. When I have bought quality tires in the past, they have generally had around 8 mm of tread. If the tires wear at the same rate, it appears I will have to replace them at a much lower mileage. It is possible that the new tires will wear at a considerably reduced rate. However, I am sceptical and suspect that I will have to replace then at rather less than 28000 miles.
Are manufacturer's quietly reducing the life of their tires for commercial reasons?
This practice is surely environmentally unsound. More used tire casings will be produced for a given vehicle mileage. Greater stress should be placed on tread depth (and longevity) of tires when they are advertised new. Perhaps a statement of the tread depth in the description should be legally required. This would help to sort out the tendency of tire manufacturers toward selling tires of reduced tread depth.
I will try and add a further review when I have had the tires for a bit longer.

Not been on long enough to say as yet

Nice , very nice and comford for my polo 9n.
Very stable when i drive for 120-150 kmh at motorways , warm early at town but note is very soft for long distance every day use .
Fine for daily use at town and a cool trip every weekend , thats all .