I've put about 5000 miles on these tires and I love them however, I have noticed an increase in road noise. It sound a little like I have have big off-road tires on. I have had them rotated, balanced and inspected for wear but the noise persisted. I have read a couple reviews on other sites who describe the exact same problem with these tires. Weird!
We purchased these for winter snow conditions in the Sierras, and mounted a set of 275/65 R 18's on a set of 18 inch factory alloy wheels from an F-150 (same dimensions as the factory spare for our vehicle). We're only about 1000 miles into them, but they have definitely more than met our expectations. Although the set of Michelin all-season radials on the stock 22" wheels do corner noticeably better for every day driving, dry handling with the KO2's is still very good despite the taller sidewalls. However on snow the KO2's are a total game changer. These tires transform my wife's mall crawler into a pretty decent off-pavement foul weather vehicle. Braking in soft snow is improved, and I'm no longer worried about getting stuck on an unplowed road. I would definitely recommend these for snowy winter conditions. They are also surprisingly quiet on the freeway, and produce more of a minor low frequency vibration at parking lot speeds that dissipates quickly as the vehicle accelerates.