I've tried them all in the new C class. The only one I might consider getting if I could go back was the blind spot assist. The CLA is somewhat hard to see out of. However I am fine without it. It all depends on your driving style and position how hard it is too look. I will say, it is quite good, but not perfect. So I would not assume it is always right when there isn't someone there.
I would also consider whether or not your insurance gives you enough of a discount for any of it to make it worthwhile.
I would also consider whether or not your insurance gives you enough of a discount for any of it to make it worthwhile.