I have the lwb sportive.
It has and does what I need 1 ton payload,full bulkhead plenty of room in back for poles with out the need to cut bulkhead to fit them in.
I have the 1.3 and it pulls the weight well ,drives ok and has a turning circle of an artic lorry.
Me personally I thinks it's a good van.My uncle had one and had no end of trouble and his was brand new, it spent more time in Vauxhall than at his and he hated it.
The garage that service mine don't rate them .
I've had no problems with mine .
The doblo will be slightly cheaper and is exactly the same van.