Well I've just swopped over MINI ONES with my brother to compare MK1 suspension with MK3.
I tried the MK1. The steering just wanted to pull itself into the left hand bends, but the right handers needed more steering effort.
The other thing is that I thought the road noise was louder too. On the straights it continued to tug to the left.
My brother immediately noticed the difference. Not only was it well balanced, but he also liked the smoother feel.

He has headed off to his dealer to get his fixed. His MINI was a Nov 01 build car.Lets see if they try to fob him off!
I have now driven 4 out of 4 pre Nov 01 build cars that ALL pull to the left. Don't anyone tell me that they have a car that is pre-November build and it drives straight. I can't comment on the Dec,Jan,and Feb cars as I have'nt driven one, but I wouldn't be surprised if they are the same.
The problem is not a quality issue it is the design that is wrong. If you don't believe me, then go and drive a post-March build MINI with the MK3 struts. Then you'll realise the difference. BMW wouldn't go to the trouble of making 3 different front suspension types if it was not a design issue would they?
BMW can be relied upon to get it right eventually, unlike some other manufacturers who can't be bothered.
Well done BMW!