I put 4 years of daily use on these tires, driving in winter and summer. Then went to storing the car in a garage/back yard for the winters.
The tires took a lot of abuse - with the car sitting for 10 months of the year without moving. Sometimes they were under inflated, sometimes they sat in a puddle all winter. And in the summer they always sat out in the sun.
Amazingly - they have survived 9 years, feeling smooth and quiet on the road every summer. This spring I will replace them because one of them is finally showing some dry rot.