Yes I do have the kit running full time, I've no clue about the compatibility, I did find a pdf once, might be tucked away in a backup, if I find it, I ll share it here.
As far as I know it subtly alters the Ecu performance maps considering other parameters, ex Throttle position, load, engine temp, boost etc.
The kit mainly adds upto the acceleration, also blips the idle for 2-3 seconds between gear changes, maybe to keep the boost ready.
I've no clue as to why it was deleted, it may have been done in UK, but considering their MoT regulations, I doubt the thriving, probably due to convenience of DPF warnings and so on maybe. As for poor fuel use, I ruled out my fears by testing the injectors.
As for spool-up theoretically the dpf is mated post turbo eh, thus it is an obstruction to the flow, producing mild backpressure as well innit.
More flow of exhaust = more spool.