Coming from a twin turbo Audi, it was hard to swallow moving into a minivan, and my wife tried hard to talk me out of it. Considered monster SUVs QX56 et al, and the Odyssey, but I decided with the AWD available in the Sienna, it made the most sense. I ordered an 07 limited AWD, with Pkg# 2 & 4. So far, I love this "Sports Van". It rides almost as smooth as my wife's RX 330, and is quite ergonomically sensible. I know I'll be a fool if I expect the performance of the Audi, but the Sienna does not disappoint. It is brisk off the standing start, but where it shines is on the highway, where you'll need to pay attention to stay within the 15 mph of the speed limit. It's that smooth.
Nav system, dynamic cruise, limited bumper already covered in clear protective plastic to prevent chips. JBL stereo system is quite nice. Still have less that 600 miles, but I measured 22 mpg on combined hwy/cty. Power folding mirrors are very nice to squeeze into the garage.
I am 6'2", and could use another 1"-2" of leg room by the foot rest.