Probably need some more specifics on what you'd like feedback on ? The Kombi is much smaller than a Sprinter though
I came out of the Vito Sport LWB into a T32 4Motion 204 Highline LWB. The Transporter is better in every respect in my opinion. However, my main driver to change was that, dynamically and at motorway speeds the Vito felt and was very unstable. The T6 is the opposite. After that, if you spec up a Highline with everything, it is an infinitely nicer place to be sat driving.
I actually also bought from Leighton Vans and I can categorically say that the customer support and service is the best I've received from any dealer/manufacturer in my life. I've had all the German cars and then some as well, so I have a good baseline for that statement. You won't be disappointed.