 This was our first Toyota!  We were looking for a reliable van one that would last 200,000+  We are 6 weeks out of warranty and the transmission is out!  No warning!  Just unable to shift into reverse and can't go over 20 mph.  Toyota said "Sorry".  Three mechanics we have talked to said this is unheard of for Toyota.  One transmission guy said he usually only see Toyotas in his shop that over 200,000 miles on them. The transmission repair shop that is fixing it said the transmissions they are putting in the vans are too small.  This was the first year for the 6 speed engine so perhaps that is the problem with the smaller transmissions.  If you want a Sienna I would look for an older used one!  This van also eats tires!  This is such a disappointment and so frustration this is why we bought a Toyota so we wouldn't have this problem :(