Many ZF5HP24s let go at 90k+ miles, including my own on the 4.4i. I am convinced this is caused by the torq converter but same end result. The overhaul of the AT is not hard but you need some patience and a little ingenuity.

My 4.8iS has gone about 12k miles in the last 2 years and the only real issues were a broken fuel pump and the bushings in the tension struts. I am not convinced by the shift logic of the 6 speed either but I would still buy the newer car anyway.

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2003 4.4i black ext./black int./black headliner (kid's runabout)
2014 535d X-drive, M package, silver/black interior

Sold but not forgotten:
2009 E70 35d, black ext./black int./black headliner (sold 2021)
2006 4.8iS Le Mans blue/cream int./black headliner, SOLD in 2012 sadly...

Other hardware:
2015 Cayenne S (wife's new DD and definitely wroooommmmm)
2016 Tundra 1794 edition crew cab, luxo hauler
2005 Tundra crew cab, weekend hauler. Sold after 150k very happy miles.