I had the Cooper Discoverer ATP tires installed yesterday at Discount Tire (285/75/16, load range E). I really do not have any real driving impressions yet since they have only been on surface streets, but no complaints either.
However, I think they look really good and that's what is most important, right? They also have a 55,000 mile treadwear warranty, so they should last me a lot longer than the Nittos I had on previously. They do appear to have a slightly more aggressive tread pattern than the Cooper Discoverer A/T3, but otherwise I think they are essentially the same tire.
Sorry for the poor pictures, I just used a camera phone.