Hi Lee
you mean the biturbo 6-in-line 535D?
It goes like a rocket, until 120 km/h you are not really slower than a M5 V10
You have to be carefull with the Turbochargers, cause they sometimes have a problem with "switch"-system between the little and the big charger...blocated.
suspension is all Aluminium, so it wears out a little faster, specialy on front.
Greetings from switzerland
Maurice