Yep, still the Pirelli P Zeros. They have roughly 20k miles on them in my ownership and unknown mileage from the previous owners. Got them both with ~9/32nds tread back in January/February 2016. Pirelli is the only manufacturer to do a 325/35R20 tire so I have to go with it again. Nothing good in the used market right now though so they will be new this time. My wallet hurts.

As for traction. I never unintentionally broke traction in the dry or the wet. They can hydroplane though if doing 75+ in a really heavy rain. In really heavy rain I keep it at 65mph and have no real issues unless I hit standing water. Not sure how hard and slippery they would get in the cold as here in south Texas the coldest we see is in the high teens to low twenties every winter.

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2005 X5 4.4i Build 04/05 Maintenance/Build Log
Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)

2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)

2010 X5 35d Build 02/10
Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)