I've had mine done ages now. Still understeers like a bast@rd on turn in and won't change that.
It does allow more throttle on the way out of the corner but it doesnt feel like a proper diff. Its good at what it does though for just being software.
I left foot brake in my clio out of tight corners but the golf doesn't allow this as if both pedals are pressed it cuts the throttle. It's pretty annoying.