 This engine has a known problem with VVT-i system that has been posted in a service bulletin since 2009.  They have done nothing to mitigate or change the design of the problem leading to a 17hr service at $90 an hour.  The issue has not been addressed by Toyota because it is not a safety issue, thus they have seen no need to issue a recall.  Beyond the vehicle being huge on the outside, claustrophobic on the interior, the vehicle's seats are not very comfortable.  The fuel mileage is poor in relation to the engine performance.  Toyota's service dept. is also poor.  An oil change for the vehicle will take nearly 2 hours regardless of which dealership you visit.  The vehicle has poor off road performance mated with below average on road performance.  The doors do not open wide enough to accommodate loading a child into the vehicle.  The voice recognition system is not useful.  The seat warmers are wonderful.  The interior is well  appointed and of good build quality.  Visibility in the vehicle is poor.  The blind spots on the vehicle are large if you sit high in the vehicle.  The B and C pillars completely obstruct the view of the next lane.  The back up camera works well but is the only reliable way of backing the vehicle due to the high lip on the rear glass.  The vehicle bump and torque steers.  The transmission has low speed lag which prevents downshifting at low RPMs.  I would in no way recommend this vehicle to anyone and I would encourage all other Highlander owners to sell theirs back to Toyota.