Also, the Sienna seemed quieter on the road too. I feel like I'm in the minority on this, but I find the QX60 to be loud, especially over bad roads. To me, the car relies on quiet tires, rather than good sound insulation.
Seriously? I find the qx60 to be one of the smoothest, quietest cars I've driven for more than a couple of days. I used to drive a Sienna... That one (much older model) cannot compare. Also driven BMW, Cadillac and Lexus of late. Except for the Lexus RX we had many years ago, nothing comes close to the qx60. Have you driven other qx60s? Maybe there is a suspension problem, or something else, with yours. Hmmmm
I've only driven other QX60s for a short while. I agree the car rides well. It rides quietly on nice roads, but on bad roads, I think it's louder than even some non-luxury crossovers out there. Like I said, I feel like it doesn't have good sound insulation. When I go over gravel roads (or roads with a lot of salt this winter), I hear all the debris kicking up inside the wheel well. My wife's 2013 Touareg is way quieter under those circumstances. The QX60 can match other premium SUVs when roads are good, but just seems more susceptible to bad road conditions in terms of noise. I've also driven the Audi Q7 extensively and that car is way quieter on bad roads as well.