IDM or CAM qualification for Digital Marketing?

[BoyMeetsWorld]

Calling all Digital Marketing Mummies! I already work in the field and have done very well for a fair few years off my BA degree ('classic' but not related) and freelance work. Now, however, I'd like some more official paperwork under my belt as a safety net.

Has anybody trained with either the IDM or done a CAM course online (if so, through which provider?). I'm leaning towards the IDM purely because I prefer their syllabus but can't find many reviews online of either and would be interested in some honest opinions.

I've not done digital marketing, but I have done a more general marketing course with CAM. Not many people seem to have heard of CAM, in my area anyway, so I always seem to end up having to explain what it is. If I say it's affiliated to the CIM then recognition dawns. If you're leaning towards the IDM, then I'd go for that.