A couple of other points.....the ITG was marketed by APR when they were with VWRacing in the UK,under the VWR name.
I think your tuner has been a little economical with the way you've been treated here,and has a duty to ensure the car runs properly before handing it over to you.
As above,you don't NEED the RS4 PRV,but if you intend to go further with the car,it makes sense to fit it now.
Agreed - when I got my ahem APR Carbonio (in hushed voice) I spoke with APR as they were the distributors of the VWR kit which I originally wanted so I'd find it hard to believe they'd be selling the VWR kit knowing it was problematic with their maps.