i took this into consideration when i chipped my jetta.
with 147kW i figured that would be enough. and the fact it would be my "family" car with my wife and daughter or either of them in the car with me 90% of the time i asked myself if i would see any benefit from it.
simple answer is yes. now has approx 180kW and has made a huge difference to the behaviour of the car. takeoff from a standstill has improved, general responsiveness has improved and since i dont thrash it the fuel economy has improved.
1957 Oval, 1974 1300, 2003 New Beetle Cabrio, 2008 Jetta TSI, 2010 Tiguan 125TSI