When shopping for a minivan, I wanted something that had less than bland styling. The quest by far is the most impressive looking minivan out there IMO - it has a very distinctive shape that no other comparable van has.
Styling aside, the biggest advantage is the interior. I own an LE model -The Honda and Toyota both have very cheap interiors. Try knocking on the dash on the Toyota. With leather seats, this truly is a luxury vehicle.
The cargo capacity is massive. Do you really plan to take out the car seats? These fold flat...anything big - rent a truck.
Navigation system - Large and easy to use.
USB port - direct connect to Ipod, listen to pod casts or playlists with ease
Great climate control with high end filter
POWER! Pass with confidence
USB port has gone funky on me a few times. (resets on and off) Not sure why.
Nav system limited while driving. Maybe for safety - but my co-pilot should be able to use the full thing.