DLu 
2015 Toyota Sienna Minivan Limited Premium 7-Passenger 4dr Minivan (3.5L 6cyl 6A)
Happily traded the 2011 for 2015!!!
 The 2015 has made improvements in basically all the areas that I've hated about our 2011 (Limited AWD).  In terms of the driving experience, he steering feel and suspension have improved slightly. Rapid inputs in the 2011 are met with a very non-linear resistance, as if it would "catch" at different points of the rotation. That's gone for 2015. The ride has firmed up a bit, but with an equal amount of improvement in body control. The 2011 was needlessly firm with still too much body roll. The improvement in NVH and the interior (see below) sealed the deal for us.