After 25k with the factory Michelin PS4s (very good tire eight until the end but chuffing pricey) I switched to acceleras after a good experience on my previous car, an E61 530d. The tires last a long time and contrary to opinion do not throw the car into a ditch. I suspect this has more to do with driver talent and awareness of risk. Their wet performance is certainly not as good as a premium tire but then I increase my spacing in the wet. Within days of the new set of tires we had a bit of snow. Although not a winter tire (it has all season written on the sidewall) and moderate braking/acceleration could break traction, they we fine and the tires combined with all wheel drive allowed me to gently make progress up hills when others where spearing off the road. The public road is not a race track and I wonder what many are asking of their tires. Personally I'd go for the acceleras and invest the saving in an advanced course. Better observation will significantly out break the better premium tire. As an example a famous motor industry presenter wrote off his pride and joy 911. The blame was apparently with the idiot that chose a bend to make a three point turn however track driving techniques don't require you to be able to stop within the distance you can see. Stories aside, these tires look good, perform adequately and at £41 a corner, they are awesome