[gIzzE]

Until you have experienced mismatched tyres you can't comment.

I had my car into BMW 3 times, they all knew something was up and replaced rear trailing arm bushes, suspension, and still couldn't find it, then one of the techs who races M3s took me out and on the second corner said "You've got mixed tyres on!!"

I was adamant I didn't, but when we pulled over and checked he was right, PS2 rears and PS1 fronts.
Swapped them over for PS2 all round and bingo, car was absolutely planted.

Had PS2s on the front and FK452s on the back of my 320d E91 touring for 3 days and that stepped out 3 times just overtaking on the motorway, a 320d!!