Replaced hazardous A20 OEMs after 25K kms with the Goodyear Assurance CS FuelMax tire. Was told by multiple sources that Goodyear makes an inferior tire (quality-wise) to Toyo, Michelin or Bridgestone ... and I understand what that means now. The Goodyear wears well, rides ok, handles ok and does what it is supposed to do ... however, it is not as smooth or refined as the OEM tire. It is too bad that there wasn't really another option at the time other than the Dueller 400 (as bad a tire as the A20). We have Blizzak winter tires for the vehicle as well ... that feel like better tires when they are on (more consistent ... it is hard to descibe).
The Goodyear isn't a bad tire ... just a really average tire ... it does everything ok, but nothing really well. If Michelin, Yokohama or Bridgestone made a long-lasting quality tire for the Highlander, I would probably consider going that route next time.
I consider this tire to be my minimum spec for what a tire should do.