I just purchased 4 Primacy MXV4 tires (85/65R15)to replace the OEM's Integrity's. Yes, they do ride smoother and Yes they are definately more quiet and seem more stable. I wanted Harmony's but local dealers were unable to provide them although Michelin said that they are available. Hope this helps somone make a decision. Seems like a reasonable choice plus the $60.00 back from Michelin. Call them and they will send you a coupon. You have to buy before Oct 31, 2008.