When I bought my GTI it had 4 Bridgestone Potenzas on, and being none the wiser I thought they were fine, until I put Continental SportContact 3's on, they make a world of difference, cornering is much easier with far more grip.
My dad has a Mk6 which he's had for about 3weeks, it came with Bridgestone Potenzas on and he says his car doesn't hold the road as well as mine does, so when he changes his tyres he'll definately be going for SC3's.
Has anyone else found similar issues? Do people like Potenza's?!