I know the Primacy MXM4 tires that come with the 18" wheels aren't well-regarded, but where I live it's simply not an option to use the Pilot Sport 4S tires year round. I would have to swap out 2 sets of wheels twice every year. We have occasional snow in the winters which do get down to freezing and also it rains a lot here in case some of you haven't heard. So I've looked at the Pilot Sport A/S 3+, these are Michelin's "high performance" all-seasons which I'm sure a lot of people who drive on only summer tires thinks is an a oxymoron. So in terms of driving performance, is there really much of an upgrade from MXM4 to the A/S 3+? Would it really be worth spending the $1,200 to switch out my tires and will I really notice any difference? Thanks.