ok heres my opinions on the car so far and ive only had it for 2 months now.
fan bloody tastic car.expensive to maintain but all i have to do is plant the petrol and then that smile that don was refering to jumps back onto you face
common probs
vanos rattle(but all vanos bmw suffer from this)
lower and upper control arms.(i replaced mine 1 week ago)
maf senors(recently replaced)
cam positions sensors tend to go after a while along with 02 sensors
lcd cluster missing pixels
thermostat probs
check all of the above before buying and make sure that things like brakes etc are good and have enough life left in them.
like i said,its expensive to maintain but what a pleasure,heavy on the juice if your heavy on the foot,then again,if you are buying it then youre obviously not gonna drive it slow

imp:
the very first time i took my m5 for a spin the car was on empty.filled her up and drove behind don to his house.when we had a nice open piece i floored it.... :shocked::shocked::shocked: :excited::excited::excited: that is what i was like.and luckily i had peed before i took delivery of the vehicle because i swear i would have pissed my pants.my leg was shaking after that run and don reckoned i was smiling like a school girl
oh yes mine is koosie venters wifes ex car