We’ve been using the Firestone Weathergrip tires for about 3-4 months now, but we haven’t really put much mileage on them since we’re mainly driving around town and covering less distance than the usual 6-10k/yr. So far, we haven’t had any problems with them, except for two of them losing air. One of them had a faulty valve stem which we replaced along with the tires, while we’re still trying to figure out the issue with the other one, which could be related to the rim.