I used to be a member, but with the distance factor, the MSCC doesn't offer much in the US. So I let it lapse many years ago. I have used the resources of the club however, primarily George Proudfoot for expertise and spares.
I am a member of the MTWC however and feel that I do get my monies worth from them, in terms of knowledge, spares and the like. Maybe this will change after the F Super in on the road. We'll see.
Cheers,