I own a 2006 Kia Sedona and I think it's pretty good - for a minivan. :-) I love all of the interior space, the side windows that roll down, and the stow and go back seats. Tons of space!
I traded in my '01 Toyota Highlander for the '06 Kia Sedona. I was looking for a smaller monthly payment and more interior space. Toyota will forever be my number one choice in vehicle, but honestly we could not afford another Toyota at this time.
A mechanic friend of mine helped me make my decision by asking me the following - "Are you going to buy this car and keep it until you drive it into the ground, or are you planning to trade the van in in a couple years?" I told him I would likely do a trade in a couple years. His response was "Then get the Kia and save yourself on the monthly payment for a few years. Toyota will always be my #1 recommendation for a vehicle, but Kia has come a long way and I think you will be happy with it for a few years."
I couldn't turn down the 2006 Kia - it has all the room we need, low miles, a much smaller monthly payment, a warrenty and it's a pretty sharp looking minivan. It simply works for us with our 2 dogs and one baby and all the gear that go along them.
I wish you the best of luck in your decision.