I have 17 inch unibody macbook pro(2009) and had no problems updating. Burn the ISO file and boot from CD and it should boot to the firmware updater program which will prompt you through the udpate process.
I'll give it a try, thanks
The update is perfectly fine, however I experience below average benchmark speeds:
I don't know if it's always this slow since I never ran the macbook with the older firmware revisions before.