This is the longest-lasting set of sport-touring tires I've ever experienced. As of this writing, it's been more than 15,000 miles since installing the BT023 in front (GT-version) and back.
Prior to that, I had been using the BT021 and was lucky to get 4,000 miles out of them. While the current set began to square-off about 8,000, they've continued to perform well in both wet and dry conditions.
As a year-around commuter, these have quickly become my favorite sport-touring tires.