Our 65 pound doodle plays a lot of tug and can destroy most toys rapidly. I just bought another one of these discs because, after 3 years, its predecessor finally got a tear. I am extremely impressed.
Aerodynamically, it's OK. Nothing like an ultimate frisbee disc. It tends to hover in the spin direction and dive in the anti-spin direction. But then, all flexible discs are like that.
One thing I like is that it flies pretty slowly, giving you a chance to set up your dog's catch with a little more control.