As far as I know you need to get the whole package. This seems a bit bad until you consider what you get for your bucks in each package, then you realise that they are actually very good value for money - very good indeed compared to the previous cost of MB extras
I went for all the packages except for the lane-assist and blind-spot one, and I don't regret my decision.
I agree, the packages do look good for the money, however there are things in the packs I don't need and would rather have the ability to pick and choose the ones I ideally want.
Anyways, I should no later this afternoon as I am putting pen to paper!