I fancied one as well, but after speaking to 3 mechanics and garages I've been warned away from them.
Apparently they see at least double as many new Transits come in as Trafics, and most of the time they need picking up, so I may stick with what I know and has been great.
Apparently the new TDCi in the Transits is prone to injector and ignition faults and leaving you stranded.
The previous versions were good, but not the new one.
Shame, I quite liked it...