My buddy's 2006 Prius needs four new tires. He's on a tight budget and would prefer to spend less than $400. Pep Boys recommended the Cooper CS4 Touring tires (T-rated). They quoted me $350 out-the-door for a set of four. The price is after the 4th tire free rebate and the $50 Cooper rebate. And they also include lifetime balancing and rotation, free flat repair, pro-rated road hazard and free alignment check. I did a search and learned that a few members are using these tires. However, most of the members had just gotten them so they were not able to give a better review. So, I'd appreciate it if those of you who are using the Cooper CS4 tires to chime in and describe your experience with the tires. Thanks!