I dont' have a stow 'n go van, but I have heard some downsides of them. I heard you don't have as big of gas tank, and something else but I can't remember it. Now I believe "Stow 'n Go" is a trademark of Dodge/Chrysler only. Other minivans have disappearing third row seats as well, but I believe Dodge/Chrysler are the only ones that allow disappearing *second* row seats.
However, on the Honda Minivan you have what's called a "Lazy Susan". This thing is AWESOME! It is a "under the van" compartmental storage that is easy accessible for passengers(front & rear). I cannot make my second row captains chairs disappear, but to be honest I probably would never need them to anyways. If for some reason we "were" needing that extra space then they very easily detach from the van and we can set them in our garage until we get back. You would be surpised just how much space there is in the back of a minivan when the third row is down. I just can't imagine us needing to ever put something back there that would take up so much space that we would need to remove our second row. DH and I have carried numerous large objects in our van, and have never needed the second row to "disappear". Now the seats *are* heavy, but not that big of a deal with help. I like the idea of Stow 'N Go if you are frequently needing that extra space in your second row, but honestly I ALWAYS have my carseats installed, so it wasn't a biggie for us. I really like the lazy susan idea in our Odyssey. I use it to store diapers, extra clothes, snacks, etc..... It can also be locked, and used to put your "eight stow away seat" in.
Here is a photo of the lazy susan....
And here is a photo of the Third Row "Magic Seat". It is a 40/60 split that disappears and folds flat. I use mine *ALOT*.