I bought 3 sets of Cooper tires this summer. We'll see how they hold up. Now ..these tires I bought on 'price' vs quality, bc they were for seldom-driven vehicles (only a few thou miles/yr), to replace rotted tires. So I don't expect them to be as good as a pr of Michelin/Bridgestones, or other premium brands. They'll all rot off before they wear out, I'm sure. However, they balanced out well and they DO go down the road great. In fact, the last set of those inexpensive A/T's balanced out super-great ...one a Hunter Road Force balancer ..which gives an initial and final balance score on the tires. A set of 10-ply Coopers I bought have been a great tire so far ..but time will tell.
I have had in the past some Coopers that went out-of-balance after a while ..but it could have been the car they were on too. Maybe a bad shock, IDK. One thing I HAVE noticed in the past is that Cooper tires wouldn't harden or weather-check nearly as much as some other brands. Therefore if a guy had them on a classic car, or vehicle that you don't drive very often, you could go a dozen years or more and they'd still look just fine. Whereas some Michelins I've owned would weather crack in literally 5-6 years. For a DD that's ok, but for something you drive infrequently, you want to get your use out of them. Must have been the type of rubber compound cooper was using, IDK. Hope that hasn't changed, but we all know what happens when companies get bought out. They lay off duplicate staff/engineering, etc. Then usually quality suffers. But at least an asian company didn't buy them.