Don't hesitate. Better than the Gen 2 Sienna. Like the layout of the dash. A friend at one point was riding with me and made a comment that the dash lights is like a cockpit.
Had the same road noise on 2010 and it turned out to be rear wheel bearings, just saying. Still have and purchased a 2018 45K miles XLE $23,000. Nice
I just got 2015 XLE for $18k, 58k miles from a private owner 2 months ago. It drives great, no complain there. The only thing I dislike is Toyota Entune. What a useless interface. Apple carplay is not available until 2018 Sienna. Car seat memory is also not available on XLE trim.
We have a 2006 Sienna LE with 314,000 miles. We have really liked the vehicle and it still runs great. Our son uses it to commute to college. I bought a 2015 LE one year ago and I love it. Not surprisingly, it is an upgrade from the 2006. It has more features, it handles better, has more power and is quieter. If you are ready to move on from your 2006 to a 2015 I am sure you will not be disappointed.