I have driven the 140 version in a Golf GT and the 170 version in an Audi A3.
GT 140's are very nice indeed to drive, I had one for a week a couple of years ago and it was one of the nicest cars I had driven, also very nice place to be on the inside, turbo surge is very satisfying. The Audi was good but I couldnt really really notice any significant difference between the two.