Royal Mail have a lot of Doblos and some Doblo XL. They are generally pleased with them, driving and capacity wise, but the DPFs are causing a lot of grief with the short journey stop/start use. This would of course be a problem with any new diesel vehicle. Very nice to drive, when they are working properly.
Doblo XL is actually slightly wider and taller than a standard Transit van, so there are issues with hitting things.