Yes and no. (just my opinion, remember)
The GTR is an absolute beast, no question it's worthy of it's place.
The Scirocco punches way above its weight on sheer speed. Running in a 544pp room at SSR7, this had only 525pp, 419bhp (not even 30miles on it) yet was still competitive. Easily reaches 200mph.
The Golf feels underwhelming, but again, this is also not run in, so may well improve. It just feels less "alive" than the R32 standard car.
I've yet to do anything to the mini, but it looks okay.
A little bit underwhelmed by the rather limited visual upgrades, if I'm being completely honest, they really should have taken a little more time and made RM versions, but standalone, they're pretty much worth the £3 something outlay.