I'd love a van this size. Too bad they nuked it, or that other manufacturers won't bring their 7 seat offerings to North America (Opel/Vauxhall Zafira, Ford S-Max, European Toyota Corolla MPV, etc).
The Odyssey/Sienna/Grand caravan is too big for 51 out of 52 weeks a year, and the Mazda5 is a great idea, but after test driving one I felt as though everything in it was designed for a midget - it was almost like all the furniture was shrunk by 20% to make the interior seem roomier. I am also just under 6 feet tall, so I am not a giant by any means. The Kia Rondo is a bit better but the 3rd row is still really tight (and a rather outdated looking vehicle, IMHO)
Both the Rondo, even with the V6, and the Mazda5 also felt underpowered and - although good for everyday commuting, just maybe not a trip through the mountains. A friend with a 5 also said he is disappointed in the fuel economy - only marginally better than the 03 Odyssey he traded in, and nowhere near advertised. Of course the old MPV was thirsty for its size as well.