Originally Posted by LantanaTX
I had P/S 2's and they did not last very long on my car. You may want to look at tire wear ratings. I got really good milage and a decent price for Yokohama Advan S4's. Some of the members really like General Tire as well.
Just got a new set of Advan S4's on my XF actually, and before them, had a set of Michelin Pilot Sport A/S's on. I can say that the Michelin's did not wear well and were very lackluster compared to how good they were rated (not to mention expensive as all hell).
The Advan's on the other hand, despite their lower ratings (which I was concerned about), are pretty solid tires. Snow melted here before I got to test them in it, but if their snow traction is as good as their wet and dry traction, snow should be no problem. So far, they've pleasantly surprised me. They ride pretty well too and aren't too expensive, at least here. We generally get a good amount of snow here (got 20-some inches in one storm this year), so snow is a concern for me as well.
If you can get your hands on a set of Continental DWS's, get them. A lot of XF owners seem to love those. I've heard they have a softer sidewall though, which can affect handling quality.