I did a bit of googling and found that in 2005 Fiat sold about 23,000 Multiplas and 15,000 Doblos. Couldn't find the figures for last year.
We were considering a Multipla before we bought the Doblo as we have 4 kids so only needed a 6 seater but I really didn't like the idea of having our youngest sat between us on long journeys. It looked very cramped, plus, she gets car sick :yuck: didn't want that all over the gearstick.