They are a great all-around set of tires. You pay a premium for them over regular performance all-seasons, but they are supposed to be really great for all weather conditions. If you are looking for a cheaper alternative, I had Continental ContiExtremeContact tires (Ultra High Performance all-seasons) with 17" aftermarket wheels and they were really great all around. They gave that shitty Jetta really good handling, really good grip, and I was pleased with their stickiness in rain and snow. When driving through the snow, as long as I took it nice and slow, I was able to get anywhere!!
My point is that the Continental ContiExtremeContacts are a much cheaper alternative, but if you can pay the Michelin Pilot Sport A/S's premium, then you will certainly get better all-around performance from them!!!