I personally work at a dealership and not a single person has complained of loss of power/economy from the software recall,
I personally wouldn't exepect a different response from VW. I'm sure the same will be said by VW about the h/w fix too.
At the end of the day I agree with Adam:
Performance/economy has to take a hit. You can't get low NOx without losing MPG/vice versa.
My mk6 2.0TDI went to the VW garage for MOT and Service, I requested they did not do the software update, and they (said they) didn't.
Car still passed the emissions test despite what they know about the effects of the trickery. I'd have thought they factor low emissions from cheated cars into the pass/fail criteria by now.