 After 5 months and 7500 miles of driving, I have a pretty good feel for the Sienna. It's a nice ride! After several trips to Las Vegas from LA fully loaded, it didn't even break a sweat going up the Baker grade, even with the AC going.  The real test of a nice ride is how you feel after a long drive and I never felt any fatigue at all. It's very roomy inside.  Able to throw lots of people and gear inside with room to spare.