They're decent cars but they are all 11-12 years old miniumum now so can need serious tlc.
Look out for:
Failing clutches and clutch hydraulics.
MAF sensors often fail (no go below 2000rpm)
Front pusher fan often fail which means the aircon won't work at standstill
Front bushes usually go by 100-120k.
Door lock actuators a very common failure point.
Examples with sunroofs very prone to leaks.
Turbos and timing chains reliable but injectors can wear giving rough idle and poor cold starting.
They're no worse than any other old BMW derived car and better than many cars from that era but some are now 17 years old so be realistic about what they'll be like.
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