3) IMO the fiat system works great, never had an unresolved issue unlike other manufactures that are struggling to meet legislation with their systems or are they claiming DPF's are not any good so they dont have to spend/design their own?
I have to agree with this point, despite my earlier problems, since having the ECU software update with the new parameters and listening carefully to the advice of the more informed forum members regarding driving style the problems have definitely become less.
I still get the DPF filter blocked light coming on sometimes but that is to be expected because of the way the car is used. The important thing is (as T states above) the system works and after a few miles at 1800 - 2000RPM the light goes out.
The fact that I am now putting the car up for sale (new TwinAir Sport ordered) is soley down to my everyday driving conditions. If I was able to alter these then my next car would have been another diesel 500, I think they are that good.