Outlook quality was unknown at the time we were considering the purchase
Base model cost more than base Sienna, and some of the desired features could ony be obtained by buying the more expensive XR model, which was not within our budget
Not as flexible for the needs of our family
Outlook cargo space was not as large nor as useful as that in the Sienna
Fuel economy was not as high as that of the Sienna, and in addition, many of the estimates seemed too high and were not supported by actual user feedback/comments found on Internet site reviews