A month ago I paid the tuners whose remap I used (Celtic Tuning) to remove or roll back the "Emissions fix" software, I was fed up with the frequency of regens regardless of the driving conditions, it was regenning 3 or 4 times a tank of fuel even if I drove 500 miles on autoroutes on a wide throttle opening towing a heavy trailer.
At my destination I was doing an 18km commute which was enough to trigger a regen but not long enough to complete, I had just done 500 miles passive regenning all the way, the measured soot was virtually zero but the calculated was at the 22 or 25g threshold, at the end of every journey the rad fan was running to show an incomplete regen.
It was definitely ignoring the measured soot values and regenning on the calculated ones, my neighbours car that has never had the fix did the opposite, the calculated values would actually come down on VCDS after he had driven for 10 miles at speed.
A month after having the fix unfixed I have done another 2000 miles if not more and never once heard the radiator fans, I have been checking the kms since the last regen and its currently on about 900 kms (VCDS shows it in meters yet calls it kms) and 13g calculated, 3g measured so it has regenned once, maybe twice but probably on the autoroute journeys.
The engine does sound sweeter and more responsive, hard to say if the economy has increased because of the differing journeys that I am doing, it is definitely no worse and on a 40km B & C (equivalent) road journey with litte traffic I have exceeded 60mpg a couple of times which I never managed before.
The anxiety of leaving a vehicle with the fans running and not being confident that they would stop has now gone!