Summary: I bought two for my rear tire replacement year ago, and I bought another pair for my front replacement recently because of the quality and tread life. This tire absolutely good and very comfortable to ride and giving me a good control especially in the snow conditions here in New jersey.
Summary: I drove 63200 miles before tread wear was down to the wear indicators, so don't expect 85000 miles but still not bad for the cost. Never had any flat tires. Rotated tires every 6k to 8k for the life of the tire. They are a little noisier than OE tires but you cant really tell that much difference between OE and these tires. I put another set on Honda Element and I hope to do as well.
Summary: Purchased these in July 2013. Went less than 6,000 miles on them and had TWO tires go bad from getting pebble punctures on them. The other two that were left looked fine and I continued to drive on them for another two months. During that two month period of time, I took my car to the service station 3x at $85 an hour to get the car looked at as it felt like I had a shimmy up front.
Summary: Excellent tire! I purchased these as a replacement to my OEM Firestone FE710's. The KR21's are flawless in the snow. They grip very well on hard and soft snow and bite good on ice too. They have proved to be the best all season tire I have ever owned. They may be slightly noisier than my OEM's but nothing that you would consider noisy. If you want an inexpensive tire that performs very well in all driving conditions, you found it.
Summary: Very quick delivery! These tires are amazing for being hard tires. Handles well in the snow and feels comfortable. They are quiet as well. Other people's reviews got me to buy them. The ratings are true! I would recommend them for a good deal. I learned more about tires recently and wished I would have noticed that they are hard tires looking at the specs. They will last longer but won't handle as well as soft tires. I hear soft tires do better in the snow too.
Summary: These tires are the second set I've had on this car. They are good tires, and grip well in rain and light snow, and also feel dependable and predictable on the highway in summer. The only reason I don't rate them higher is that the last set came nowhere close to the 85k mileage 'guarantee.' More like 45k, but I consider that to be the norm for tire life anyway, so as long as you aren't really expecting to get a full 85k out of them, you'd do well by these.