is it worth dealer servicing my bike?

[AlexG]

service it yourself, take a few pics at the time of servicing and keep the receipts for the parts used.

This ^ and download the official BMW maintenance schedules and fill them in whenever any work is done.

It is a difficult call when the bike is still fairly new, but the older they become the less important it is, until it reaches the stage where a dealer service could actually be a liability because their skills are on newer technology...