Agree that iO is definitely worth it. I've noticed that they will go out of their way to help you. Once i needed to book a chauffeur drive with less then 7 hours of notice, not in Dubai, but in Houston, and they were able to do it! It's these small things that make me really appreciate being iO. I remember when I was platinum and they couldn't book me a car to IAH with even about 20 hours notice.
I also love how fast our luggage is delivered to the carousel. And of course the car to/from aircraft makes remote stands a little better!
For those that wonder how i attained iO status, i fly between Dubai and Houston around once/twice a month in J (sometimes F) and then a bunch of flying to Europe/Asia/Africa from Dubai. I also have employees that fly EK a lot, so I guess I received iO because of the amount of money I (or my company) spends on Emirates.