There are endless threads on this. Consensus seems to be to follow what BMW say - although there are those who disagree with this.
Personally, while there are some very knowledgeable people on here, as someone who isn't privvy to any special knowledge on the subject I'm inclined to just do what the guys who build the car say instead of confuse myself with the disagreements of random people on the internet. Also, personally I like to take it easy at first anyway as it gives me time to get used to the car before I start pushing it.
Enjoy your new wheels!
