We've had two Siennas and love them. Like most Toyotas, the seats, including the rear seats, are very comfortable. The mileage is typically a bit over 21 mpg. Few maintenance issues even over 100000. We currently own a 2010. We bought it really for when we have grandchildren visiting and because it has 8 seats and works out great. Even with the back seats in use, the storage space behind the seats is quite good. I've not been in an Odyssey, but in several other minivans. We love that the Sienna, unlike other minivans, handles and feels like a car, not a truck.