I just replaced mine. Both of them went by 65K miles. I have an x drive as well.
The job is very easy on a lift. Make sure you remove the axle bolts on each side (buy new axle bolts; they are one time use)
These arms are known to go bad around 60K miles on modern BMWs. $700 for this job is asinine.
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2014 EBII 435ix - Stage 2+ Dragy: 0-60 3.61; 60-130 10.18
2020 MG M340ix - Dragy: 0-60 3.48
2018 LBB X4M40i - Stock Dragy: 0-60 4.85
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