The 1.9 TTiD is basically the same engine as before, but modified a bit. All modern diesels are horribly complicated to my eye. The original diesel was a very simple thing that could run on virtually any old oil. But they were noisy and smoky. All the complexity is to overcome the noise and smoke. The extra add-on emissin control bits were added in a rush to comply with some political imperative, and they are still trying to get it all to work. It's better but not there yet.
We had a Mercedes diesel years ago. It was a simple non-turbo one. I hated it. Would never have another diesel. Far too expensive to run. Just about viable if someone else is picking up the repair bills during the warranty period, but completely non-viable as a high mileage second hand purchase.
Exhaust gas recirculation sends gummy gluey stuff back into the inlet. The control valve sticks. There are swirl flaps in the inlet manifold that stick and break due to the gummy stuff. The exhaust is filthy enough to need filtering which is more gummy/gluey sludge that blocks the exhaust. The turbo has moving vanes inside to improve the efficiency. There are two turbos and all the gummy/gluey stuff goes through them. The whole thing is a Heath Robinson pile of poo.
In my opinion of course!!
My friend has a 2.0T XWD estate and loves it. High in the air and comfy and fast, with low roof rails. Looks nice.