What happens is that the directionals and asymmetrics each give different feedback to the ESP system and it thinks it needs to rescue you and so applies braking as it sees appropriate. This 'feedback' is the result of differences especially in the wall stiffness of the tyres.I found it happened more at speed in long bends - Very scary the first time when it was on a road with stone walls either side and the car unexpectedly snatched. I kept my foot planted and found that driving through it was the best way when it happened again. Always random - I even tried to induce it on the same stretch of road but perhaps I wasn't going quite as fast for fear of what might happen. Once I knew what it was (advised by Goodyear Technical) I ignored it but it's still not nice.
You may find this helpful: http://www.tyrereviews.co.uk/
That is cheap but I bet they find a reason to fail it. Cynical, me? Never...
As I was out in the car today (dropped my daughter plus some girlies to Glastonbury Festival), I dropped in on a few places and am fairly sure I'm going for the Goodyear Asymmetric 2 tyres - £147 each. Rubber will have another price increase in about a month's time.
^^^^Simon and Ian: Perhaps some of it is down to personal preferences of the feel, or even inflation differences though I expect both of you followed the psi recommendation.Like Rich, I can't fault the Goodyear's grip. I rarely get scrabble and it gets taken care of very quickly.It would be interesting to hear the opinion of someone who has had both PS3's and GY1's, although GY2's are the current ones.