These came with my car. They had no noticeable wear when I got the car, and I drove them for 7,000 miles and they had no noticeable wear. The reason I got rid of these tires was because they hydroplane extremely easily and should not be driven in rain, even the most mild sprinkle is unsafe with these tires. I know I'm far from the only person who has had the problem with these tires.
There was a light sprinkle and I very lightly tapped my gas, I wasn't gunning it or anything and I went across the road and an oncoming car barely had enough time to stop before anybody was killed. I called the local tire shop, ordered winter tires early and had them get rid of these. The Blizzak WS60s that I replaced them with not only were much safer, but were quieter, and rode better. I would assume leave them on the car all year round.
I picked up some Continental ExtremeContact DWs for summer tires, and those too are cheaper and ride much better.
Do yourself a favor and look elsewhere -- it might save your life.