This has been a very reliable vehicle. We bought this van used with 34000 miles on it. Although it is a CE it has many upgrades such as tinted windows, an upgraded CD system, etc. It currently has around 182000 on it and we have had no problems. It is a smaller van, which I happen to like, but it is laid out well inside. You can fit a surprising amount of luggage or groceries in the back, and you can stow things under the seats. The two sliding doors are great - no worrying about climbing and reaching car seats. If you are looking for a low maintenance reliable mini-van I highly recommend the 99 Sienna.
Its smaller size, storage under the seats, no expensive repairs, just routine maintenance. Nice interior. Easy to access back seat.
Tail lights are too low and dim. Poor turning radius makes U-turns impossible. Gas mileage could be a little better. Without snow tires the Sienna is useless in the smallest amount of snow.