 Just traded in our 07 Odyssey EXL-RES after 1 years use for the AWD option on the Sienna.  We have approx. 500 miles on the Sienna.  Over all the Sienna instrumentation/controls are much more intuitive, hated the Ody instr.  Ody felt big and bulky but did give a very comfortable ride.  Sienna's ride is a bit stiffer but much more responsive, gives the driver a better feel of control and is quite comfortable.  Very good visibility.  Heat on our Sienna is very poor in cold weather (>32F) and never seems to get comfortable in cold.  We do all short hop drives and expected poor mileage but our 14 MPG is a bit ridiculous.  Hope this will change after the break-in. Would not go back to the Odyssey.