Even with the original n63 there were some gems. Mine has been particularly trouble free. By contrast, and somewhat related my 7-series had the N62 TU of that generation and it was just as troublesome as the original so take the whole TU thing at face value. With BMW V8s it's always a bit of a gamble IMHO.
Have the codes read, check for smoke, give it a good test drive and check for an up to date service record.
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