Nice. Easy decision to get 4 vs 2. Though the michelines are likely the better tire. If only be concerned with them being louder really as performance shouldn't be vastly different unless you track your x5.

FWIW I've run different tread patterns on my e53 for 25000 miles now. No ill effects. As long as rolling diameter is the same, the x5 won't care. Think about it, the OE staggered setup always had more traction in the rear vs the front. There's 40mm more contact patch. If the xdrive couldn't handle it, BMW wouldn't spec it with staggered setup.

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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)