I got two years and 50,000 miles out of these tires and for the most part, I must say that I am pleasantly surprised that they lasted as long as they did. These are the OEM tires on my 2011 Prius 3 and they have been absolutely trouble free from day one but there are good and bad parts about any product so here goes.
For those not familiar with the Prius, I need to qualify my minor quibble about the road noise of tires because the Prius is a very quiet car most of the time. At a traffic light the engine turns off so the silence can be eerie. On the highway, the engine shuts off too so you only hear wind and road noise. Since I have 2 Prius' with different tires (the other car has Kumho Solus tires), I can tell the difference easily.
To be clear, this is not a big difference in noise loudness so much as a difference in frequency and feel. The Goodyear tire seems to transmit more vibration as well as road noise.
Bulletproof. Absolutely bulletproof. In my decade of driving I've never had a tire perform as well over a long period of time. I did not notice a drop off in performance until after 45,000 miles when the traction control beeped during a spirited launch.
Better still, the fuel economy I got with these tires averaged 51mpg over 50,000 miles with best economy at 65mpg (running the car with no heat or a/c typically returns about 58mpg).
Since I am one to meticulously maintain my vehicle, I attribute that and regularly scheduled tire rotation as one of the factors in this tire's longevity but those factors aside, this is a great tire in my opinion. Although I like this tire, I'm going to try something different next time but if they do not work out I will buy these again for my other Prius.