(G) Doblo driving seat

I'm possibly buying a Doblo at a distance as I am unable to travel far , so I'm getting an inspection from a local garage. As I can't actually sit in it I would find it very helpful to get peoples opinions on the comfort of the driving seat/position. I've been a passenger in one and that seemed fine , but it's not the same as driving. I hear that the post-2010 models are comfortable , does anyone know if the seats are the same fitting? Or have people put other makes of seats in to improve the driving experience for their bad back?
Any response most appreciated.