Hi
The Nissan Kubistar and Renault Kangoo come from the same stable.
The Doblo is Fiat and only available from that supplier.
Reviews generally are some motor mouth's impressions of that model, usually with an incentive to produce a good review. What we want is a genuine review of how a working van has performed in service over a period of time, (at least a couple of years).
What I find concerning is the number of manufacturers out there who haven't got very good gearboxes including Renault Trafic (6 speed box) and variants and Citroen Relay and variants prior to '52' plate.
As Nissan have found with Renault, a takeover doesn't always produce a better van. Whilst I like the lines of the Trafic van the old Cargo Vanette, was better mechanically that the Trafic will ever be, even considering its terrible engine access, but that's only my opinion.
Spruce