My late build 07 has been flawless with the exception of some minor issues all covered under CPO. All of my BMW tech friends that work both indie and at a stealership say the 4.8 version of the X5 is pretty good AS LONG AS YOU MAINTAIN IT WELL. Mine just hit 99k yesterday

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The Present:
2014 Audi Q5 TDI Prestige
The Past:
2013 Lexus GS350
2013 VW Golf TDI
2007 BMW X5 4.8i LOADED & Loved
2009 VW Jetta
2008 VW Touareg VR6
2005 BMW X5 3.0i
2005 BMW Z4 3.0i
2004 BMW X5 3.0i
2003 BMW 325i
2000 Ford Explorer Eddie Bauer 4x4