I too have Pirelli P4's for my '04 Altima 2.5 S(205-65-16) on the OE steelies. I use them only in the autumn/winter months(NOV-MAY) but, I'd love to keep'em on all year long as I really love these tires. The P4's are a sticky tire that has helped "minimize" the standing start wheel spin of the OE Conti's from the Altima's torquey 4cyl engine. What I like is:
1)Great snow/ice traction for a FWD vehicle.
2)Nice hiwy tracking with little wander in strong X-winds.
3)Handle very good for a "T" speed rated tire.
4)Very, Very good hydroplaning resistance.
5)Decent ride with no noticable noises except when evacuating water(which has a sort'a mild..."jjjjjjjsssshhhhh" sound!)
6)Nice steering feel
7)Yet to have'em rebalanced(4 winters now)
Yes, they can be a little stiff in the single didget temps but, that smooths out as the car is driven. For the way I drive(easy), this tire is nicely suited for the Altima's charactor, IMHO(or at least, what I perfer!)
I have a set of 17" wheels/tires for the other months(JUN-OCT) which look great but, they're only OK(G/Y Eagle LS) and difficult to keep balanced. They see little miles during the summer months as I have a summer car to drive as well.